INDEX TO VOLUME 34

Leading articles are in bold face type; notes, abstracts, and reviews are in or- dinary type. Only minerals for which definite data are given are indexed.

Absorption of inf:rared radiation by axial angle .. 559 powdered silica minerals. 274 (Keller, Pickett). 855 Accessory elements in pegmatites, Bader, H. Defnition of Euclidean distribution of. I" Theory. geometricalsyrnmetry...... 226 (Holland, Kulp).. ..35,278 Screw axes of symmetry Activity measurementsof micro- andtheirsymbols. 752 radioactive inclusions. (Ya- Bailey, D. A. Conversionof amor- goda).. 285 phoussilicatoquartz...... 60l Adoms, C. E. wiUhTunell, G. Sym- Bailey, R. K. Talc in the salinesof metry and crystal structure of potash field near Carlsbad, Ed- bornite. 824 dy County, New Mexico . . . . 757 Aggie Creek meteorite from Sew- Bannister, F. A.. . 614 ard Peninsula, Alaska. (Hen- Barium mineral, new, from Benallt derson). 229 manganesemine, Rhiw, Car- Ahlfeld, F.. . . . 133 narvonshire.(Smith, Bassister, Altaite. 361 H"y) . . 614 Aluminium fluoride minerals, ob- Barnes, W. H. Some comnents on servations on. (Ferguson). 383 the Buerger precession meth- American GeologicalInstitute.... 620 od for determination of unit Analcime suite ,cf igneous rocks, cell constants and space Brewster Co., Texas. (Lons- groups. 173 dale, O'Neill) 280 Unit cell and space group Analysis of rock-forming minerals of childrenite. 12 by spectrochemicalmethods in Unit cell and space group petrologicalresearch(Strock). 284 oflindgrenite...... '... 163 Anatase, occurrencein sedimentary Unit cell and space group kaolin. (Nagelschmidt, Don- of probertite. 19 nelly, Morcom). . . . . 132 Corrections to papers on Anderson,J. L. l?seudotachyliteof proberiteand lindgrenite 6ll the Antietann quartzite . . . . 331 Barshad, I. Nature oflattice expan- Andersonite. . 274 sion and its relati,on to hydra- Andrews, K. W.. . 769 tion in montmorillonite and Andrewsite. 534 vermiculite...... 675 Antimonial silver ore from Cobalt, Baryite bearing nodules from Mid- Ontario. (Wells). 456 dle Lias of the East Midlands. Antimony (Taylor). . . . . 337 and tellurium minerals ' in western Canada, further oc- Basaltic. fan jointing induced by currencesof (Warren, Thomp- aqueouschilling. (Fuller). . . . . 276 son). . . 458 Bastnfisite and xenotime' petro- Arrojadite and g:raftonite from the graphic distinction of. (Foster) 830 Nickel Plare Mine, South Bates,T.F...... 274 Dakota. (Lindberg) 279 Bayleyite. 274 Atterberg plastic limits of clay Beatty, S. v. D. X-ray spectrometer minerals. (!!hite). 508 study of mica powders . . . . 74 Axelrod, J. M. antl Grimaldi, F. S. Bentonite, Wyoning' fluorescence Muscovite with small optic study of. (Browa). 98

899 900 INDEX

Bentonite, fluorescence test of. red radiation by. (Keller). . . . (Hseung, Yeh). . . 000 Clay minerals, Atterberg plastic Beraunite. 536 limits of. (White). 508 Berry,L. G...... 275 Clay mineral names, glossary of Biotite, *-ray data. 79 (Kerr,Hamilton)...... 618 Bodenbenderite,a discreditedspe- Clays, International Committee cies.(Milton, Myers). . . 608 forStudyof..... 612 Borickite. 70r Clinopyroxenes, c ofilmon, chemical Bornite, symmetry and crystal composition and optical prop- structure of. (Tunell, Adams). 824 erties of. Part I. (Hess)...... 62r Bracewell,S...... 339 Clino2oisire from Camaderry Mt., Bragg, W'. L. Acceptance of the Glendalough, Co. Wicklow. Roebling Medal of the Min- (Johnston) 132 eralogical Society of America. 238 Coloradoite. 363 Brazilianite,optical data 92 Committee on Measurement of Brindley,G. W...... 337 Geologic Time, report of. Brown, B. W'. Fluorescence study l9+7-48 (Marble) 766 of \Myoming bentonite...... 98 Copper in California, Bull. 144, Buerger, M. J. Fourier summations State Division of Mines. Book for symmetrical crystals. . . . . revlew. 768 Buerger precessionmethod for the Corrego Frio pegmatite, Mitras determination of unit cell con- Gerais: Scorzalite a:rd souza- stants and space groups, some lite, two new phosphate min- comments on. (Barnes) 173 erals (Pecora, Faley)...... 83 Buttgenbach,H...... 618 Cryolite, x-ray data 384 Cryolithionite, rc-ray powder data. 384 Calaverite..... 347 Crystallization of basaltic magma Calcioferrite...... 701 as recorded by variation of Calcite, natural solid solution ef- crystal-size in dikes. (Winkler) 338 fects in. (Andrews) 769 Crystallography, Conference on Canadian mineralogy, contribu- teaching of. (Donnay, Fisher, tionsto. ..341-469 Gordon, Peacock, Tunell). . . . 288 Cancrinite from Blue Mountain, . Ontario. (Phoenix, Nufeld).. 452 Dake,H. C...... 134 Charting fve a:rd six variables Dana's Mineralsand How to Study within the bounding tetra- Them. (Hurlbut) Book review 616 hedra of hypertetrahedra. Das Bestimmen der Mineralien. (Mertie)...... 280,706 (Ktihler) Book review...... 767 Chayes, F. Simple pointr counter Dedolomitization and its relation for thin-section analysis.. . . .1, 600 to a possible derivption of a ,,7 < ' magnesium-richhydrothermal Childrenite, unit cell and space solution. (Faust). 789 group of, (Barnes). 12 De Ment, J. . . t34 Chloritoid from Megaatic County, Derry,D. R...... ztJ Quebec.(Milne). 422 Dervillite. (Weil). 618 Claffy, E. W'. and Ginther, R. J. Die Entwicklung der chemisphen with Schulman, J. H. Some Elemente. Part II. (Efremov) observations on the crystalli- Book review. 6t7 zation of silicic acid. . . 68 Differential thermal analysis aP- Clay minerals,absorption of infra- paratus, improved' (KulP' TNDEX 901

Kerr)...... 839 lite, two trew phosphate min- Difierential thermal analysis erals... 83 curves of siderite, variations Scorzalite from South Da- in. @owlandl, Jonas). 550 kota, a new ocsurrence.. . .282,685 Dolomite, unusual, from Portsoy, Faust, G. T. Dedolomitization and Banff. (Harry, Patterson).. 61.5 its relation to a possible mag- Donnay,J.D.H...... 288 nesium-rich solution. 789 Donnelly,H. F.. . 132 tr'erguson,R. B. Aluminiumflueri66 Dreyer, R. M., Garrels, R. M., and nins14ls,observations on.... 383 Howland, A,, L. Liquid inclu- Ferrous iron and silica determina- siotrs in halite as a guide to iions.(Hey)...... 769 geologicthermometry...... 26, 276 Fisher,D.J...... 289 Dufrenite problem (Frondel). . . . . 513 Forman, S. A. and Peacock, M. A. Crystal structure of rickardite, 'W. Early, Studies of natural and Cur-*Tez. 441 J. 'W. artificial se,lenides: I-Kock- tr'oster, R. Petrographic dis- mannite, CuSe. . 435 tinction of xenotime and bast- Eastonite, x-ray data. 77 nesite. . 830 Edwards, A. B. Natural ex-solution Fourier summations for symmetri- intergrowths of magnetite and cal crystals.(Buerger)...... 771 hemarite. 759 Fourier Transforms and Structure Efremov, N. Die Entwicklung der Factors. (Wrinch) Book re- chemischen Elemente. Part view... 129 II. Book rerriew. 617 Franklin, V. with Wolfe, C. W. Egueite 701 Refractive indices of high in- Empressite. dex liquids by the prism meth- Enargite and tennantite, hydro- od on the trvo-circlegoniome- thermal synthesis. (Gaines). . 276 ter.. 893 Ervin, G., Jr., and Osborn, E. F. Friedmao, I. I. Laboratory growth X-ray data cm synthetic meli- of quirrrtz. 583 lites. . . 717 Frohbergite. 360 Etching iron mel.eorites, improved Frondel, C. CrystallograPhY of method of. (Reberholt, Hen- spangotite. 181 derson) 606 --. The dufrenite problem. . . . 513 'W'olfeite, Euclidean geometrical symmetr5r, a xanthoxenite, defaition of. (H. Bader). . . . . 226 and whitlockite from Palermo Eudialyte in quartz-bearing sye- Mine, NewHampshire...... 692 nites.(Nockold.).... 769 -- ard Palache, C. Retgersite, Evaporites of East Yorkshire, NiSO4'61110'a new mineral. petrology of. (Stewart). . . . ., 614 . .188,276 Ex-solution intergrowths, natural, Frondelite and the frondelite-rock- of magnetite and hematite. bridgeite series. (Lindberg).. 541 (Edwards) 759 Fuller.R.E...... 276

Fahey, J. J. with Murdoch, J. Gabbro-granite transition in Nor- Geikielite, a new find from folk County, Massachusetts, California. .281,835 remainsof. (Chayes)' . .. . 275 --r with P_eoora,W. T. Cor- Gaines.R. V.. . 276 rego F'rio'pegmatite, Minas Game,P. M...... '....614,615 Gerais: scolzalite and souza- Garnet an4 associated minerals of INDEX

the Barton Mine near North teaching aids in optical min- Creek, N. Y., paragenesis of eralogy. (von Huene) 121 (Shaub). 573 Grenwell-Wells, H. J. and Golledge, Garnet, physical analysis of poly- A. with Young, R. S. Mag- component.(Levin) 279 netite crystals from a copper Garrels, R. M. and lfowland, A. L. converter. ,. . 761 with Dreyer, R. M. Liquid in- Grimaldi, F. S. with Axelrod, J. M. clusions in halite as a guide to Muscovite with small optic geologicthermometry ...... 26,276 axial angle. 559 Gault, H. R,. Frequency of twin 274 typesinquartzcrystals..... 142 C.ooer, n. ffrL, U""rv B. C., anO Gearksutite, *-ray powder data 385 I{eystek, II. Suppression of Geikielite, a new find from Cali- thermal reactions in kaolinite 869 fornia. (Murdoch, I'ahey). . . 281, 835 Guimar6es.D..... 770 Geologicthermometer, variable in- version tempeqature of qtattz Ilale, D, R. and llurlbut, C. S., Jr., as a. (Tuttle). 723 Quartz sphere grown into a Geologic thermometry, liquid in- facedcrystal.... 596 clusion in halite as a guide to. Halloysite-metahalloysite transi- (Dreyer, Garrels, Howland) . 26, 276 tion, effectof temperatureand Geothermometer, decrepitation. pressure.(Brindley, Robinson, (Peach). 413 Goodyear) 337 Geothermometry,liquid inclusions Halloysite, transition to metahal- in. (Peach) 460 loysite, in relation to relative Geschic'htedes Goldes. (Quiring) humidity. (Brindley, Good- Book review. 617 year)...... ; 337 Gesteine und Minerallagerstetten. Handbook of Uranium Minerals. Vol. I. (Niggli) Book review. . 128 (DeMent, Dake) Book review. 134 Giannetite.(Guimardes)..... 770 Harry,W.T...... 615 Ginther, R. J. with Schulman, J. H. Hedleyite. 364 and Claffy, E.'W. Some obser- Heinrich, E. Wm. 278 vafions on the crystallization Book reviews. of silicic acid. . . 68 . . . .128,616, 617, 764, 765 Glass,J. J. and Vhay, J. S. A new Ilematite-goethite relations in locality for ludlamite .... 335 neutral and alkaline solutions Goldsmith, J. R. Some aspects of under pressure. (Smith, Kidd) 403 system NaAlSiOr-CaO .Al:Oa. Ilenderson, E. P. Aggie Creek ...277,47r meteorite from Seward Penin- Golledge,A., and Grenwell-Wells, sula, Alaska. 229 H. J., with Young, R. S. Mag- with Hess, H. H. Moore netite crystals from a copper County Meteorite; a further converter. 761 study with comment on its Goodspeed,G. E.. . 277 primordial environment ...... Goodyear,J. .. . 337 . ..287,494,763 Goongarrite and warthaite discred- with Perry, S. II. The 'Wathena, ited.(Thompson)...... 459 Doniphan Co. Kan- Gordon,S. G... 291 sas, meteorite 102 Graftonite (Lindberg) 279 with Reberholt, B. O. Im- Graham, A. R. Artificial pyrrhotite 462 proved method of etching iron Grain-thin sections and other meteorites. 606 INDEX 903

I{enry, E. C. and lfeysfek, H- with earths alrd other elements by Gruver, R. IW: Suppression of use of molecular spectra 667 thermal reactions in kaolinite. 869 Jarlite, rc-ray and optical data. Hess, E. II. Chemical eomposition (Ferguson)... .. 386 arrd optical properties of com- Johnson, L, R. with Zerfoss, S. mon clinopyroxenes.. 621 Crystal chemical relations in .- with Henderson, E. P. inorganic piezoelectric mate- Moore Cou:lty Meteorite; a rials...... 61 further studly with comment Johnston,R.W...... : 732 on its primordial environment Jonas, E. C. with Rowland, R, A. 278,494,763 Variations in differential ther- Hessite...... 354 mal ana[ysis curves of siderite Hey, M. H.. . . .614,769 .. ..282,550 Heystek, H. with Gruver, R. M. IoseiteA... 365 and Ifenry, .E. C. Suppression io""it" B .. .. 367 ' of thermal reactions in kaolin- Jujuyite (Ahlfeld) I J.) ite...... 869 Hildebrand.F. A.. . 274 Kaiman, S. Lattice spacing for Ifoldenite, Mooreite, and torreyite, glancing angles with iron r-ra- : x-ray study of (Prewitt-Hop- diation . 465 kins). 589 Kaolin minerals, electron micros- Holland, If. D. and Kulp, J. L. copy of. (Bates, Hildebrand, Distribution of accessory ele- Swineford) 274 ments in pegmatites. I. Theory Keller,'W. D. and Fickett, E. E. .. .. 35,278 Absorption of infrared radia- Holmes, R. J. arr

-and Kerr, P. R. Improved Mathias,M...... 132 differential thermal analysis McKinstry, H. Mineral isograds apparatus. 839 iu southern Pennsylvania.... 874 Melilites, synthetic, r-ray data on. Lacroix,A., memorial of.(Orcel).. 242 (Ervin,Osborn)...... 717 Lakeside No. 70 transparent ce- Melonite. 359 ment, noteson. (von Huene). . . . 125 Melvin, J. H. Me morial of Lewis Lane, Alfred Church, memorial of. Gardner'Westgate. 256 (Larsen). 249 Mertie, J. B., Jr., charti::g fve and Larsen, E. S. Jr., Memorial of six variables otr the bounding Alfred ChurchLane...... 249 tetra-hedraof a hypertetra- Latice expansion and its relation hedra.. .280,706 to hydration in montmoril- Merumite (Bracewell).. . 339 lonite an vermiculite (Bar- Meta-halloysite, Random layer shad).. 675 structure. (Brindley, Robin- Lattice spacingsfor glancingangles son). . . 337 with iron r-radiation. (Kai- Methyl-ethyl ketone as an index man.. 465 liquid.(Wherry)..... 613 Law of Rationality to the law of Meteorite collections,list of cata- Bravais. (Donnay) 288 loguesof. (Spencer) 132 Laubm'annite. S34 Mica powders, r-ray spectrometer Lepidolite, x-ray data. 77 study of. (Beatty). 74 Levin, S. B.... . 279 Milne, I. H. Chloritoid from Me- Lindberg,M.L. Frondeliteandthe gantic County, Quebec...... 422 frondelite-rockbridgeite se- Milton, C. and Myers, A. T. Bo- ries...... 541 denbenderite,a discredited 279 species. 608 Lindgrenite, unit cell and space 274 groupof.(Barnes). 163,6ll Mineral isograds in southern Liquid inclusions in halite as a Pennsylvania. (McKinsky). . 874 guide to geologic therrrome- Mineral, what is a? (A, N. Win- try. (Dreyer, Garrels,How- chell)...... 220,284 land)...... 26,276 Mineralogicalcrystallography,ob- Lithium-bearing pegmatites in jectivesin teachingof. (Fisher) 289 Northern Quebec.(Derry). . . . 275 Mineralogical Society of America. Lonsdale,J. T., and O'Neill, K. K. 280 Announcementof 30th Annual Ludlamite from the Falenno mine, Meeting. 340 North Groton, New Harnp . List of correspondents,fel- shire (W'olfe). 94 lows, members, and sub- Ludlamite, a new locality for. scribers. 293 (Glass,Vhay) 335 proceedingsof the twenty- nrnth annual meeting at New Magnetite crystals from a copper York, N. Y. 267 converter. (Young, Golledge, Mineralogical Society (London). . Grenwell-Wells)..... 761 ..132,337,614,769 Manchester, James Greenfield, Mineralogy, prospect of. (M. A. memorial of. (Stanton). . . . . 253 Peacock). 135 Marble, J. P. Report of committee Mohs' scale, correlation with on measurementof Geologic Vicker's hardness numbers. time, 1947-48. 766 (Taylor) 768 INDEX 905

Montbrayite..... 345 Nockolds,S. R.. . 769 Montmorillonite and vermiculite, Nufreld, E. VI. with Phoenix, R. nature of lattice expansionand Cancrinite from Blue Moun- its relation to hydration in. tain, Ontario. 452 (Barshad). .. .. 675 Moore County mreteorite: a further Olivier, C. P. Note on Aggie Creek sfudy with comment on the meteorite.. . 232 primordial environment. Olivines from South African meli- (Hess, Ilenderson). . . .278, 491, 763 lite-basalts.(Mathias)... 132 Mooreite, r-ray study of. (Prewitt- O'NeiII,K.K...... 280 Ilopkins)...... 589 Optical constantsand thicknessof Morcom, A. J.. . . 132 thin sections, determination Morenosite (optical data). 193 of. (Game) 615 Morey,G.W...... 281 Orcel, Memorial of A.Lacroix. . 242 Morphological crystallography, J. Osborn, E. F. with Ervin, G. teaching of. (Peacock) 291 Jr. X-ray data on syntbetrc meii- Moyd, L. Petrology of the nephe- lites... 717 line and corundum rocks of Owyheeite(Robinson). 398 southeasternOntario. 736 Murata, K. J.. . 274 Murdoch, J. and Fahey, J. J. Palache, C. with Frondel, C. Ret- Geikielite, ar new flnd from gersite, NiSOr'6IIzO, a new California. ....281,835 mineral. 188,276 Muscovite with small optic axial Paraguanjuatite(Ramdohr). 619 angle. (Axeh'od, Grimaldi). . . 559 Parajamesonite. (Zsivny, Naray- Muscovite with 3-layered mono- Szabo). 133 clinic structure. (Axelrod, Gri- Patterson,E. M.. . 615 maldi). 565 Patton.L. T...... 281 Muscovite,r-rayd.ata.,. .. 78 Peach, P. A. Decrepitation geo- Museum, role of, in teaching thermometer. 413 crystallograprhy.(Gordon)... 291 Geothermometry, liquid Muthmannite . 373 inclusionsin..... 460 Myers, A. T. with Milton, C. Bo- Peacock, M. A. Prospect of min- denbenderite, a discredited eralogy...... 135 species. 608 291 --- and Forman, S. A. Crystal Nagelschmidt,G.. . 132 structure of rickardite, Cur" Nagyagite. 363 Ter.... 441 Naray-Szabo,I...... 133 Pecora, W. T. and Fahey, J. J. Nepheline and corundum rocks of CorregoFrio pegmatite, Minas southeastern Ontario, petrol- Gerais: scorzalite and souza- ogyof.(Moyd)...... 7j6 lite, two new phosphate min- Neptunite in quartz-bearing sye- erals... 83 nites. (Nock;olds) 769 Scorzalite from South Nesterova,Y. S., 619 Dakota,a new occutrence..282,685 New mineralnarnes. . .133,339, 618,770 Pennaite (GuimarSes) 779 Nichols,J. B. Bookreview...... T68 Pepinsky,R. Bookreview...... 129 Niggl,i, P. Gesteine und Mineral- Perry, S. IL with Elenderson, E. P. lagerstiitten. Book review 128 The Wathena, Doniphaa Co. Niggliite. 373 Kansas, meteorite. lO2 906 INDEX

Petrographic miscroscope, iner- crystal (Ifale, Ifurlbut)..... 596 pensive. (Winchell, Vlalton). . 688 Quartz, variable inversion tem- Pettijohn, F. J. Sedimentary Rocks. perature of, as a Possible geo- Book review. 764 logic thermometer. (Tuttle). . Petzite. -. 350 .284,723 Phlogopite,x-ray data...... 80 Quiring, H. Geschichtedes Goldes. Phoenir, R. and Nufreld, E, W. Bookreview. 617 Cancrinite from Blue Moun- tain, Ontario. 452 Radioactive Measurement with Phosphoscorodite.(Shadlun, Nes- Nuclear Emuls.ions.(Yagoda) terova). 619 Book review 765 Pickett, E. E. with Keller, W. D. Ralstonite, x-ray d.ata.(Ferguson). 393 Absorption of infrared radia- Ramdohr,P...... 619 tion by powdered silica min- Reberbolt, B. O. and Henderson, efals... 855 E. P. Improved method of Piezoelectric materials, inorganic, etchingiron meteorites...... 606 crystal chemical relations in. Refractive indices of high index (Zerfoss,Johnson)...... 61 liquids by the prism method Plagioclasesfrom Sultan Hamud, on the two-circle goniometer. Kenya. (Game) .. 614 (Wolfe, Franklin) 893 Point counter for thin-section Retgersite, NiSO'6H2Or a new analysis.(Chayes). . .1,600 mineral. (Frondel, Palache). Pough, F. E. Memorial of Ilerbert 188,276 PercyWhitlock.. ... 261 Retrogressivealteration following Pre-Beltian Rocks near Dillon, granitization and rheomorph- Montana.(Heinrich)...... 278 ism(Goodspeed) ...... 277 Precision lattice measurements of Rhodocbrosite, thermal study of. pyrite from Leadville, Colo., (Wright, Kulp, Holmes). 195,285 observations on. (Wasser- Rickardite, Cuc"Tez, crystal struc- stein)..... 731 ture of. (Forman,Peacock). 359, 441 Prewitt-I{opkins, J. X-ray study Riley,D.P...... 132 of holdenite, mooreite, and Robertson,F..... 282 torreyite...... 589 Robinson,K...... 337 Probertite, unit cell and space Robinson,S. C. Owyheeite ..... 398 group of. (Barnes). .l9,6ll Rockbridgeite,optical and chemi- Prosopite, x-ray data. (Ferguson) 391 cal data. (Frondel) (Lindberg) Prospect of mineralogy. (Peacock) 135 .525, 528,543 Pseudotachylite of the Antietam Roebling Medal of the Mineralogi- quartzite. (Ander.son). 331 cal Societyof America: Pres- Pyrrhotite,artificial.(Graham) 462 entation to William Lawrence Bragg.(Tunell)...... 235 Quartz, artifi cial, by hydrothermal Roebling Medal of the Mineralogi- methods. (Swinnerton) 284 cal Society of America' accept- Quartz, conversion of amorphous ance of. (Bragg). . . 238 silica to. (Bailey) 601 Roedder,E. W.. . 292 Quartz crystals, frequency of twin Rosenholtz,J, L. and Smith' D. T. typesin. (Gault). 142 Linear thermal expansion of Quartz, laboratory growth of. calcite, var. Iceland sPar and (Friedman). 583 Yule marble. Quartz sphere grown into a faced Rowland, R. A. and Jonas, E. C. TNDEX N7

Variations in differential ther- Smith, W. Campbell. 614 Souzalite and scorzalite, two new T::1"":*':*:: "::i::\E . rro phosphate minerals, Corrego Frio pegmatite, Minas Gerais: '83 Schairer,J. F.. 283 (Pecora, Fahey). Shulman, J. II., lJlaffy, E. W'. and Spangolite, crystallography of, Ginther, R. .[. Some observa- (tr'rondel)...... -l 181 tions on the crystallization of Spectrochemical methods of rook silicic acid. 68 analysis.(Strock) 284 Scorzalite from South Dakota, new Spencer,L.J...... t r32 occurrence.liPecora, Fahey). Stanton, G. S. Memorial of James .282,685 Greenfeld Manchester...... 253 Scorzalite and so'uzalite. ts'o treur Stewart.F. H.. . 614 phosphate mLinerals, Corrego Stobbe.H...... , 283 Frio pegmatilte,Minas Gerais: Strock, L. W.. . 284 (Pecora,Fah,ey)...... 83 Stuetzite. 373 Screw axes of syrnmetry and their Svanbergite from Nevada. (Swit- symbols.(Bader)...... 752 zet). . . 104 Sedimentary Rc,cks. (Pettijohn) Swartzite. 274 Book review. 764 Swineford,A.. : 274 Sekanina,j...... 618 Swinnerton,A. C.. 284 Selenides, natural and artificial: Switzer, G. Svanbergite from I-Klockmann.ite, CuSe @ar- Nevada.. 104 Iey)... 435 Sylvanite. 353 Sengierite: a pre,liminary descrip- SystemHzO-NaO-SiOz, Isothermal tion. (Vaes,I(err)...... 109,763 polybaric saturation curve at Sengit,E. R.. . . 132 400'in. (Morey) 281 Shaub, B. M. Paragenesis of gar- System KrO-N{gO-AhOrSiOz, net and associated minerals phaseequilibrium relations in of the Barton Mine near North thequaternary.(Schairer) ... 283 Creek,N.Y...... 573 SystemKsO-MgO-SiOz.(Roedder)282 Shadlun,T. N.. . . 619 System (NaAlSiOrCaO'AlzOa' Siderite, variatio:ns in differential ':-: 'nl'uil'.T],, thermal analysis curves of. :::*::11 u,, (Rowland,Jonas). .282,550 Silica percentageins a factor in rock Talc in the salinesof the potash classification.(Wells). .... 615 field near Carlsbad, New Silicic acid, somerobservations on Mexico. (Bailey) 757 the crystallization of. (Schul- Taylor,E.W... .. 769 man, Claffy, Ginther). .... 68 Taylor,J.H...". 337 Silicocarnotite,b;lsic slag mineral, Tellurbis,rnuth 367 opticaland *-ray examinalion Telluritle minerals and their oc- of. (Riley, Sengit) 132 currence in Canada. (Thomp- Smith, D. T. with Rosenholtz, J. L. son)... 342 Linearthermal analysis of lce- Tellurium minerals,occurrences in land spar and Yule marble. . . 846 western Canada. (Warren, Smith, F. G. and.Kidd, D. J. Hem- Thompson) 458 atite-goethite relations in Tennantite, hydrothermal synthe- neutral and alkaline solutiotrs sisof.(Gaines).... 276 under pressure 403 Tetradymite...... 370 908 INDEX

Thermal expansion, linear, of cal- A new locality for ludlamite. 335 cite, var. Iceland spar, atrd Visual arc spectroscopic detection Yule marble. (Roseaholtz, of halogens, rare earths and Smith). 846 other elements by use of mo- Thermal reaction in kaolinite, sup- lecularspectra. (Jaffe) ...... 667 pression of. (Gruver, Ilenry, Volcanic rocks of northeastern Eeystek).... 869 New Mexico, petrology of Thompson, R. M. Goongarrite and (stobbe.) 283 warthaite discredited. 459 Volcanicrocks, St. FrancoisMoun- Telluride minerals and tains, Missouri, high potash. theiroccurrenceinCanada. .. 342 (Robertson,Tolman). . 282 ---with Warren, H. V. Further Von Huene,R. Grain-thinsections occurrencesof antimony and and other teaching aids in op- tellurium minerals in western tical mineralogy...... 121 Canada. 458 Notes on Lakeside No. 70 Tol'man,C...... 282 transparentcement... .. 125 Torreyite, r-ray study of. (Pre- witt-Ilopkins) 589 Walker N{ineralogical Club, By- Tunell, G. Presentation of the laws,officers1948...... 469 Roebling Medal of the Min- Proceedings. 133,470 eralogical Society of America Walton, M, S. with Winchell, H. to William Lawrence Bragg. 235 An inexpensive petrographic 292 microscope,...... 688 and Adams, C. Symmetry Warren, H. V. and l'hompson, It. and crystal structure of bor- M. Further occurrences of nite.. . . 824 antimony and tellurium min- Tuttle, O. F. Variable inversion eralsin westernCanada.. . . 458 temperature of quartz as a Warthaite discredited.(Thompson) 459 'Wasserstein, possible geologic thermom- B. Observations on eter...... 284,723 two precision lattice measure- Twin types in quartz crystals, fre- ments of pyrite from Lead- quencyof. (Gault). 142 ville, Colo. 731 Wathena, Doniphan Co. Kansas, Uranium minerals from the Hill- meteorite. (Henderson, Perry) side Mine, Yavapai County, to2 Arizona. (Axelrod, Grimaldi, Weberite, r-ray data. (Ferguson). 395 Milton, Murata) 274 Wehrlite. 369 Weil,R.. 618 Vaes,J. F. and Kerr, P, F. Sengier- Weissite.. . .t.') / ite:apreliminarydescription . 109 V\:ells,A.K, .. .. 615 Variable inversion temperature of Wells, R. C. Antimonial silver ore quartz as a possible geologic from Cobalt, Ontario. 456 thermometer,(Tuttle)...... 723 Westgate, Lewis Gardner, me- Variables, charting five or six, on morial of. (Melvin). 256 the bounding tetrahedra of a Wherry, E. T. Methyl-ethyl ketone hypertetrahedra.(Mertie) 280, 706 as an indexliquid.. 613 'White,'W. Varlamoffite(Buttgenbach)...... 618 A. Atterberg plastic lim- Vauquelinite, r-ray measurement itsofclayminerals...... on. (Berry) .. 275 Whitlock, Herbert Percy, menio- Vhay, John G. and Glass,Jewell, J. rialof. (Pough)...... 261 INDEX 909

Whitlockite frorn Palermo Mine, Xanthoxenite from Palermo Mine, New lfamp,shire. (Frondel) 692 New I{ampshire. (Frondel) 692 Winchel, A. N. \lrhat is a mi,neral? Xeuotime and bastnEsite, petro- 'Winchell, . . .220,284 graphic distinction of @oster) 830 E. and Waltnn, M, S. X-ray crystallography,teaching of . An inexpensiive petrographic (Tunell) 292 microscope. 68g Winkler, H. G. F. 'SI. 338 Yagoda, H. Radioactive Measure- Wolfe, C. Ludlamite from the mentswith NuclearEmulsions. Palermo mine, North Groton, Book review.. 765 NewHampsliire...... 94 285 and Frarrklin, V. Refrac- Yeh, C. C. with Hseung,Y. Fluo- tive indices of high index liq- rescencetest of bentonite.. . . . 896 uids by the prism method on Young, R. S., Golledge,A., and thetwo-circlegoniometer.. 'W'olfeite, ... 893 Grenwell-Wells,H. J. Magne- xanthoxenite, and whit- tite crystals from a copper lockite from Palermo Mine, converter. 761 New llampshire. (Frondel) 692 Wright, E. D. and lfolmes, R. J. Zerfoss, S. and Johnson, L. R. with Kulp, J. L. Thermal Crystal chemical relations in study of rhodochrosite. 195, 2gs inorganic piezoelectric mate- Wrinch, D. Fpurier Transformsand rials. . . 6l Structure Factors. Book re- Zinnwaldite, r-ray data.. . 81 view.. . 129 Zsivny,V...... 133