TNDEX TO VOLUME 21 Leading articles arq in bold face t5rpel notes, abstracts gnd re- views are in ordinary type. Only for which definite data are given are indexed.

Adamite from Chloride Cliff, Cali- Babingtonite and ePidote from fornia.(Murdoch).... 811 Westfield, Mass. (Palache).t93,652 Aguilarite from Comstock lode, Bacalite. (Buddhue). 269 Virginia City, Nevada.(Coats) 532 Baier, E. and Schmidt, W. Lehr- Ahlfeld,D...... 270 buch der Mineralogie. [Book Aidyrlite (Godlevsky) 269 reviewl. 267 Akermanite. lg3 Balk,R andKrieger,P.Devitrified Alexander,A. E. Locality for opal- felsite dikes from AscutneY ized spherules 266 Mt., Vermont 516 lgg Baltimorite ' 463 Allemontite, tc-ray study of. Barber,C. T.. . 388 (Holmes) 202 Barite in red beds of Colorado. Allen, V. T. Dickite from St. Louis, (Ilowlantl). . . 584 Missouri. 457 Barth, T. F. W.. . 204 Mineralized spherulitic Book review. 331 Iimestone in the Cheltenham Bastite...... 463 fireclay. 369 Bates limestone, Lewiston, Mainet Alling, H. L. Interpretative petrol- minerals in. (Fisher)...... 200,32t ogy of igneousrocks. [Book re- Beiyinite.(Ho)... 214 viewl.. 813 Bentonitic magnesian clay-min- Al-atoms in the two reaction series; eral. (Foshag' Woodford)'.. 238 role of. (Brammall). . 268 Berman,H...... '..' 201 Amarillite. (Ungemach). 270 Bermanite, a new PhosPhater oc- Ammonium molybdo-ditellurate, curring with triPlite in Arizona. crystallography of. (Donnay, (Ilurlbut). 655 M6lon). 250 Berthierite' crystallographic data' Amygdaloidal dikes. (Moehlman). 329 unit cell atrd space group. Andalusite in pegmatite. (Mur- @uerger). .205,442 doch). . 68 Bertrandite and epistilbite from Anderson,B. W.. . l+0 Bedford,N. Y. (Pough)..... 264 Anorthite from Duke Island, Biographisch-literarisches Hand- Alaska. (Glass). 201 wdrterbuch fiir Mathematik, Antigorite. . 463,494 Astronomie, PhYsik mit Geo- Anterlite, r-ray powder data for. physik, Chemie, Kristallogra- (Waldo) 7I phie und verwandte Wissens- Arsenoferrite, probable non-exist- gebiete. (Poggendorff) [Book enceof. (Buerger). 70 reviewl. 535 Arsenopyrite group, crystal struc- Blockite.(Herzenberg, Ahlfeld). " 270 ture of. (Buerger). 203 Boldyrev, A. K. Are thete 47 or 48 Asbestos, minerelogy of. (Syromy- simple forms Possibleon crys- atnikov). 48 tals?... 731 Augelite. (Pough). 536 Book of minerals.(Hawkins) [Book "Autoliths," orientation of min- reviewl. 74 eralsin. (Pabst) 68 Borax.(Schaller)... . 192 819 820 THE AMERICAN MINERALOGIST

Bowen, N. L. and Ellestad, R. B. Caesium molybdo-tellurates, crys- Nephelinecontrasts...... 363 tallography of. (Donnay, Book review. 813 M6lon). 299 193,678 Calaverite.(Tunell,Ksanda)..... 2A3 Bowenite. 463 Calcic plagioclases,chemical com- Brammall, A...... 268,388 position and optical properties Brandtite. 600 of. (phillips, Hess). . L94 Brauns, R. Mineralogie. [Book re- Calcite twins from North Plain- viewl.. 815 field,N.J. (Hawkins)...... 204,809 Brochantite,r-ray powderdata for. Callaghan,E...... 198 (waldo) 7l cameron, E. N. with Kerr, p. F. Bruner, F. H. Uraninite from Fullerts earth of bentonitic Hottah Lake .. 265 origin from Tehachapi, Calif. 230 Buddhue, J . 269 Cape Neddick, Maine, dikes of. Buerger, M. J. Crystallographic (Hatr). . 197 data, unit cell and spacegroup Cases for display and storage of forberthierite (FeSbsSa)...205,+42 specimens.(Gordon)...... 196 Crystalsoftherealgartype: Cassiterite crystals of distorted s5mrmetry,unit cell and space habit from Pilbara goldfield, group of nitrogen sulfide. . . . . 575 western Australia. (Simpson) t40 ---- Law of complication. .. 702 Cerite, radioactive, deposits near - Probablenon-existence of Jamestown, Colo. (Goddard, arsenoferrite. 70 Glass).. 199 X-raypowdercamera.. 11 Chapman, W. M. Feldspar twin- .203,205,206 ning in a differentiatedsill... 33 and Bufler, R. D. Tech- Chlorite, third study of. (W'inchell) nique for construction of ...194,642 models illustrating arrange- Claudetite, occurrence in Imperial ment and packing of atoms in Valley, Calif. (Kelley) . . . . . 137 crystals. 150 of ionic minerals. (Shap- and Lukesh,J. S. Prepara- pell)...... 75,390 tion of oriented polished sec- ClevelandMineralogical Society. . 461 tions of smallsinglecrystals.. 667 Clinoferrosilite.(Bowen) ...... 678 Buie, B. F...... L97 Coats, R. R. Aguilarite from Com- Burri, C.. 269 stock lode,Virginia City, Nev. 532 Bustamite from Inyo Co., Calif. Complication,law of. (Buerger).. 702 (Murdoch, Webb). 69 Cordierite, optically positive, in tlll., Butler, J. Jr. Origin of emery Kisseyenew gneiss at Sherri- depositsnear Peekskill, N.Y. 537 don, Manitoba. (Rutherford) 386 with Buerger, M. J. Tech- Cristobalite. 689 nique for construction of mod- Crystal forms, 47 or 48 possible? els illustrating arrangement (Boldyrev) 731 and packing of atoms in crys- Cubanite, of. tals.. . 150 (Buerger). 205 Buttgenbach, H. Les min6raux et Cubanite from Sudbury, Ontario. les roches,6tudes pratiques de (Peacock,Yatsevitch). . . . . 55 cristallographie, p6trographie Cummingtonite from the Black et min6ralogie. [Book reviewl 2II Hills, S. Dakota. (Wayland). . 607 Bytownite, optical data and Currier, L. W. Memorial of C. H. analysis. zLg Richardson...... 178 JOURNAL MINERALOGICAL SOCIETY OF AMERICA 821

Cyclic permutation of crystallo- Dowie,D. L...... 268 graphic axes.(Peacock) . 136 Drugman,J. L. E.. 6t2 Dunham, K. C, Xenoliths in the Dana, E. S., memorial of. (Ford). . 173 Organ batholith, N. Mexico. . 312 Danburite, melting of. (Morey, Ingerson). 194 Edingtonites, substituted, *-raY Davis, H. T. with Ilentlerson, E. P. examination of. (TaYlor). . . . 140 Moore County, N. Carolina, Edmundson, R. Phosphaticcon- meteorite-Aneweucrite.... 215 cretions near Junction CitY, DeJong,W. F. and Delange, J. J. Ky..... 529 X-ray study of pucherite.. . . 809 Ellestad, R. B. with Bowen, N. L. DeLange,J. J. with DeJong,W. F. Nepheline contrasts. JOJ Pucherite. 809 Emery deposits near Peekskillt De Leenheer,L.. 270 N.Y., origin of. (Butler)' . . . ' 537 Denn.rr,M.V...... 197 Emigh, G. D. Improved Vander- Devitrified felsite dikes ffom wilt rock saw. . . . 670 Ascutney Mt., Vermont. Epidote from Westfield, Mass' (Balk,Krieger).. 516 (Palache). 652 Deweylite. . . .467,496 Epistilbite from Bedford, N.Y. Dickite in Missouri. (Tarr, Keller) (Pough) 264 . . 109,195 Essaide d6termination des propri- Dickite from St. Louis, Missouri. 6t6soptiques d'un mindral Par (Allen). 457 la mesure,en lumiDreParallele Dielectric coostant of oblique. des retards en dif- 115 powders. @osenholtz, Smith) f6rents points d'une lame Differentiated igneous intrusion, cristalline. (M6lon) [Review] 331 peculiarform of. (Buie) .... t97 Eulysites and related rock-tYPes Diopsides from southern Cali- from Loch Duich, Ross-shire. (Merriam, fornia. Lauder- (Tilley). 268 milk).. 715 morphological descrip- Diopside, Faust, G. T. Fusion relations of and analysis.(Peacock). . 318 tion of iron-orthoclase, with dis- 193 Diopside. cussion of the evidence for the T. A. Rapid microscopic Dodge, existelce of an iron-orthoclase for distinguishing method molecule in feldsPar. 735 from untwinned oligo- Feldspar,replacing fossils. (String- clase-andesine 531 ham).. 200 Dolomites,castellated, from Major Feldspar twinning in a differenti- Co. Okla.(Merritt).... 604 ated sill. (ChaPman)- 33 Donnay, J, D. H. [Book review].. 211 L. W. Minerals in Bates and M6lon, Crystallog- Fisher, J. Lewiston, Maine molYbclo- limestone, raphy of ammonium 200,32L ditellurate. 250 CrystallograPhY of Fluorite-silica PseudomorPhs. (Mur

Foshag, VI. f,'. and Woodford, A. O. Ifackmanite from Bancroft, Ont., Bentonitic rnagnesian clay- reversible photosensitivity in. minglal 238 (Lee).. 764 Fraser, D. M. Paleozoic pegmatites Ilaff, J. C. Igneous rock names and in the Pennsylvania highlands 662 their evaluation...... 427 Frondel, C. Orientetl inclusions of 197 tourmaline in muscovite. . . . . 1i, Elatton, J. II. An inexpensive table Fuller's earth of bentonitic origin forpolishingores..... 800 from Tehachapi, Calif. (Kerr, Hawkins. A. C. Calcite twins from Cameron). 230 N. Plainfield,N.J...... 204,809 Book of minerals. [Book Ganophyllite and zincian amphi- reviewl . 74 bole from I'ranklin Furnace, Henderson, E. P. and Davis, II. T. N.J. @oshag) 63 Moore County, N. Carolina, Germanium,test for. 383 meteorite-Anew eucrite... . 215 Glass,J. J...... 199,201 and Glass, J. J. Pyroxman- with lfenderson, E. p. gite, new locality, and identity Pyroxmangite, new localityl of sobralite and pyroxmangite 273 identity of sobralite and pyrox- Herzenberg,R...... 270 mangite 273 Herzenbergite(kolbeckine). (Ram- Goddard,E.N...... 199 dohr). . 677 Gabbro near Philadelphia,Penna., Hess, I[. If. with Phillips, A. H. alterationof. (Watson)...... 2OO Metamorphic difierentiation Godlevsky,M. N.. 269 at contacts between serpentin- Gold and silver in the crystalline ite and siliceous countqrrocks 333 rocks of the Malvern Hills. 194.198 (Brammall,Dowie)...... 268 Ho, T. L.. 214 Gonyer, F. A. with Larsen, E. S., Hobbs,W- H. Book review...... 676 Irving, J., and Larsen, E. S. Holmes,R.J...... 202 3rd. Peuologic results of a Honess,A. P. Book review.. . . 676 study of the minerals from the Howell, D. E. with Kennard, T. G. Tertiary rocks of the San Jua.lr Spectrographic examination of region, Colo.. 679 Siamese zircons. 721 Gordon, S. G., . 196 Howland, A. L. Occurrence of ba- Greenalite structures, probably rite in red beds of Colorado. . 584 identity of. (Gruner). 205 Hunt, W, F., Kraus, E. H. and Greenalite, structufe and chemical Ramsdell, L. S. Mineralogy. composition.(Gruner)...... 449 [Book review]. 676 Greig, J. W., Merwin, H. E. and Hunt, W. F. Bookreviews. . .74,535,815 Posnjat, E. Separation planes Hurlbut, C. S., Jr. A new phos- inmagnetite...... 193,504 phate, bernanite, occurring Grossularite (analysis and optical with triplite in Arizona...... 656 data).. 9 X-ray deterrnination of the Gruner, J. W. Hydrothermal alter- silica minerals in submicro- ation of montmorillonite to scopicintergrowths... 727 feldspar at 245'-300"C... .201, 511 198 Stnrcture and chemical Hutton, C. O.. . 268 6qmposition of greenalite. .205, 449 Ilydrothermal alteration of mont- - Book review. 267 morillonite to feldsparat 245'- ...... 204.205 300'C.(Gruner)...... 20l,5ll TOURNAL MINERALOGICAL SOCIETY OF AMERICA 823

Hydroxylapatite. (Burri, Jakob, Khazanovich,I. K... 269 Parker, Strunz). 269 Khibinite(Khazanovich)...... 269 Hypersthene,optical data...... 220 Klockmann's Lehrbuch der Miner- alogie. (Ramdohr) [Boo! re- Identification of minerals by re- viewl.. . 535 flected light. (Wright).... 200 Kolbeckine (Ramdohr) 677 Igneous rock names and their Kraus, E. H., Hunt, W. F. and evaluation (Haff). 427 Ramsdell, L. S. Mineralogy. fmmersion liquids of high refrac- [Book review] . 676 tive index. (West). 194,245 Book reviews...... 535,6Ll,8l4 Ingerson,E...... 194 Krennerite, calaverite and sylvan- Interpretive petrology of the ig- ite, relation betweenstructural neous rocks. (Alling) [Book and morphological elements reviewl. 813 of. (Tunnell,Ksanda)...... 203 Iron orthoclase, fusion relations of, Krieger, P. with Balk, R. Devitri- with discussion of evidence for fed dikes from Ascutney Mt., the existence of an iron.ortho- Vermont. 516 clase rnolecule in feldspar. Ksanda, C. J...... 203 (Faust) 735 Kyanite-eclogites, paragenesis of. Iron strigovite.(Palmquist)...... 269 (Tilley) 612 Irving, J. with Larsen, E. S., Gon- yer, F. A. and Larsen, E. S. Laboratory mus€um collection. 3rt1. Petrologic results of a (Rogers). 196 study of the minerals fron the Lapparent,J. de... 678 Tertiary volcanic rocks of the Lapparentite. (Ungemach) 332 San Juanregion; Colo...... 679 Larsen, E. S., Irving, J. Gonyer, Ishkyl

Lokka,L.... . 269 Meteoric stones from S. Australia Lukesh,J. C. with Buerger,M. J. -Lake Labyrinth and Kap- Preparation of oriented pol- pakoola. (Spencer) 388 ished sections of small single Microchemical methods in deter- crystals. 667 minative mineralogy. (Staples) . 195,613 Magnesian clay-mineral. Microscope with universally mov- 'Woodford). @oshag, 240 abletube.(Sueno)..... 295 Magnetite metacrysts. (Schwartz) 635 Mine dust, determination of min- Magnetite-plagioclase rocks of eral composition by means of Magnet Heights, Bushveld, r-rays.(Walker)..... 193 Transvaal. (Wells) 268 Mineral classification according to Magnetite, separation planes in. cleavage and . (Greig, Merwin, Posnjak). . 193,504 (Seaman)[Bookreview] ..... 139 Malvernian hornblendes: their Mineral determination by micro- genetic relationship. (Bram- chemical methods. (Staples) mall,Leech) ...... 388 . .195,613 Marble, J. P. Possibleage of mona- Mineral gallery, how to make the zite from Mars Hill, N. Car. 456 public observe and think. Marmolite. 463 (Walker, Parsons). .. 196 McAdams, R. E. Accessory miner- Mineral museum and the people. als of Wolf Mt. granite, Llano (Whitlock). r97 Co.,Texas. ...128,207 Mineralized spherulitic limestone in the Cheltenham fireclay. M6lon. J. with Donnay, J. D. H. (Allen)...... Crystallography of ammonium s69 (Brauns) molybdo-ditellurate..... 250 Mineralogie. [Book re- viewl. . Crystallography of caesium 81.5 Mineralogy. (Kraus, molybdo-tellurates..... 299 Hunt, Rams- dell) review]. 676 Crystallography of lithium [Book Mineralogy in the commercial rnu- molybdo-tellurate... . 125 seum. (Toothaker)... 196 Essai de d6termination des Mineraloids. (Rogers) 194 propri6t6s optiques d'un mi- Mineralogical Society of America. n6ral par la mesure,en lumidre Constitutional amendments and paralldle oblique, des retards changes in By-Laws. .. . .272,460 en diff6rentspoints d'une lame List of former officers and meet- cristalline. review].... 331 [Book ings.... 209 Merriam, R. and Laudermilk, D. J. Nominations for officers for 1937 61t Two diopsides from southern Preliminary list of titles for 17th California. 715 annualmeetinC...... 817 Merritt, C. A. Castellated dolo- Proceedings of 16th annual meet- mites from Major Co.,Okla.. . 60+ itrg..... 183 Merwin, H. E., with Greig, J. W., Report of auditing cornmittee. 271 a:rd Posnjak, E. Separation Report of committee on nomen- plaresinmagnetite...... 193,S04 clature. 188 Metamorphic differentiation at Mineralogical Society of Great contacts between serpentilite Britain and Ireland. and siliceous country rock. . .r40,268,s88,612 (Phillips, Eess).. 333 Min6raux et les roches. 6tudes Metaxite. 463 pratique de cristallographie, JOURNAL MINERALOGICAL SOCIETY OF AMEMCA 825

p6trographie et min6ralogie. Northrop, S. A. Analysis of thu- (Buttgenbach) [Book review] 2ll lite.... 73 Models illustrating affangement Nuolate.(Lokka)... 269 and packing of atoms in crys- tals, technique for construc- Oborite.(H")...... 214 tion of. @uerger, Butler). . . . 150 Olivine. t98,70L Moehlman, R. S. Amygdaloidal Opalized spherules, locality for. dikes... 329 (Alexander) .. 266 Mohler, N. M. Spectrophotometric Oriented polishedsections of small studyof smokyquartz...... 258 single crystals. (Buerger, Monazite from Mars Hill, N. Caro- Lukesh) 667 lina, possibleage of. (Marble) 456 Montmorillonite, hydrothermal Pabst, A. Orientation of minerals alteration to feldspar at in "autoliths. 68 245"-300"C.(Gruner) .. 20I,5n Vesuvianite from George- Moore Co., N. Carolina, meteorite town,Calif...... :...... 1 -A new eucrite. (flenderson, Palache, C. Babingtotiite and epi- Davis). 215 *:llul'l*il';;, Morey, G. W... L94 i:i:::- *, Morse, H. W. and Donnay,J. D. II. 195 Optics and structure of three- Paleozoic pegmatites in the Penn- dimensional spherulites. . .201, 391 sylvania highlands.(Fraser).. 662 Morven meteorite,an aerolitefrom Palmquist,S...... 269 S. Canterbury, New Zealand. Paracoquimbite.(Ungemach)..... 332 (Hutton) 268 Parker. R. L.. . 269 Mounting minerals for exhibition. Parsons,A. L. . 196 (Palache) 195 Payne,C.J...... t40 for.m of Muench, O. B. Sulfur in cyrtolite Peacock, M. A. Crystal ...... 103 and its indication of. galena.. 374 sternbergite. Cyclic permutation of crYs- Murdoch, J. Adamite from Chlo- tallographicaxes... L36 ride Cliff. Calif.. . 811 - Morphological descriPtion - Andalusitein pegmatite... 68 ofdiopsidecrystals... 318 Silica-fluorite pseudo- Roselite and the rule of morphs..... 18 highest pseudo-sYmmetry. . 202, 589 - and Webb, R. W. Busta- and Yatsevitch, G. M. . mite from Inyo Co., Calif. . 69 Cubanite from SudburY' Ont. 55 Peck, A. B. with Slawson, C. B. Natural resins, refractive indices Deterrnination of refractive in- (Alexander). of. . I99 dices of minerals by the im- Nepheline contrasts. @owen, mersion method. 523 Ellestad). . . 363 philadelphia Mineralogical Society New Haven Mineral Club...... 461 ..14,t42,267,589,461,536,815 New Xlineral names . Phillips, A. II. anrl Hess, H. H. .214,269,270,332,67 7 Metamorphic differentiation New York Mineralogical Club. . . . at contacts between serpentitr- r40, tlt, 390,536, 612, 816 ite and siliceous coutrtrY rocks JJJ Nitrogen sulfide, symmetry, unit 194 cell and spacegroup of (Buer- Phosphaticconcretioris near Junc- ger). 575 tion City, Ky. (Edmundson) 529 826 TH E AMERICAN MINERA LOGIST

Picrolite...... 463 Quartz, smoky, spectrophotometric Picrosmine . . 463 studyof.(Mohler)...... 258 Pigeonite,optical data. 22I Quartz. 682 Plagioclase feldspars, heat effects on optical orientationof. (Bar- Ramdohr,P...... 535,677 ber).... 388 Ramsdell,L. S., Kraus, E. H. and Plagioclase, pyroxene and olivine Hunt, W. F. Mineralogy. variation in the Stillwater [Book review] 676 complex,(Hess). 198 Refractive indices of minerals, Poggendorff, J. C. Biographisch- determination by the immer- Literarisches Handw6rterbuch sion method. (Slawson, Peck) 523 fiir Mathematik, Astronomie, Resins, natural, refractive indices Physikmit Geophysik,Chemie, of.(Alexander)...... 199 Kristallographie und ver- Retinalite. 463 wandte Wissensgebiete.[Book Reversible photosensitivity in reviewl 535 hackmanite from Bancroft, " Polaroid" for photographing large Ont.: A ne\r property of matter thin sections in crossed polar- (Lee).. 764 ized light. (Shaub) 384 Rhodonite, iron rich; analysis, r- Porcellophite. 463 ray and optical data. 287 Posnjak, E,, and Merwin, H. E. Richardson, C. H., memorial of. with Greig, J. W. Separation (Currier). t78 planesinmagnetite...... 193,504 Richmond, W. E. Crystallography Potash-feldspars from Good- of livingstonite...... 204,719 springs,Nevada, unusualtwin Rogers,A. F... ,..194,196,207 laws.(Drugman)...... 612 Roselite and the rule of highest Pough, F. H. Bertrandite and epi- pseudo-spnmetry. (Peacock) stilbite from Bedford, N.Y. . . 264 . .202,589 JJO Rosenholtz, J. L. and Smith, D. T. Powellite.(Pough)...... : J.to Dielectric cotrstant of mineral "Pseudo-cbpiapite." (Ungemach). 27r powders. 115 Pseudowollastoniteand wollaston- Ross, C. S. Mineralization of the ite solid solutions with diop- Virginia titaniun deposits . . I43, 192 sideand akermanite.(Schairer, Rule of highest pseudo-s5rmmetry. Bowen). 193 (Peacock) ...... 202,589 Psilomelane, pyrolusite and hol- Rutherford, R. L. Optically posi- landite, 3c-tay studies on. tive cordierite in Kisseyenew (Vaux). 389 gneissat Sherridon,Manitoba 386 Pucherite, r-ray study of. (De- Jong,Delange)...... 809 San Juan region, Colo., petrologic Pyroidesine. 463 study of the rninerals from Pyroxenes...... 198,220,694 Tertiary volcanic rocks. (Lar- Pyroxmangite, new locality; iden- sen, Irving, Gonyer, Larsen) 679 tity of sobralite and pyrox- Saponite...... 467 mangite. Qlenderson, Glass) 273 Schairer,J.F...... 193 Schaller,W, T...... 192,202 Quartz, method for distinguishing Scheeliteleuchtenbergite deposit from untwinned oligoclase- in the Paradise Range, Nev. andesine.(Dodge). 531 (Kerr,Callaghan).... 198 IOURNAL MINERALOGICAL SOCIETY OF AMERICA 827

Schmidt, W. and Baier, E. Lehr- Specific gravity balance, improved. buch der Mineralogie. [Book (Kerr). l2l reviewl. 267 Spencer, L. J. Key to precious Schwartz, G. M, Magnetite meta- stones.[Book review]. 6ll crysts.. 635 ...388,389,612 Schweizerite. 463 Spinels,gem, from Ceylon. (Ander: Seaman,W. A. Mineral classifica- son,Payne)...... 140 tion according to cleavageand Staples, L. W. Mineral deterrrina- crystal habit. [Book review]. . 139 tion by microchemical meth- Selfridge, G. C., Jr. X-ray and ods...... 195,613 optical itrvestigation of ser- Simple microchemical test pentinemhrerals..... 463 for silicon. 379 Seligman, G. Snow structure and Book review. 139 skifields.[Bookreview]...... 676 Sternbergite, crystal form of. Sepiolite,chemical composition of. (Peacock) 103 (Schaller). 202 Stillwater complex, plagioclase, Serpentine ninerals, x-tay and pyroxene and olivine varia- optical investigation of. (Self- tion in. (Hess). 198 ridge).. 463 Stilpnomelane, structure of. Serpentinite. 501 (Gruner). 204 Shappell, M. D. Cleavage of ioaic Story of gems. (Whitlock) lBook minerals. . . .75,390 reviewl . 814 Shaub,B. M. Useof "polaroid" for Stringham,8...... 200 photographing large thin sec- Strunz,H...... 269 tions in crossedpolarized light 384 Sueno, T. Microscope with uni- Shonkin Sag laccolith, differentia- versally movable tqbe...... 295 tionin.(Hurlbut)...... 198 Sulfur in cyrtolite and its indica- Silica-fluorite pseudomorphs. tionofgalena. (Muench)..... 374 (Tunell, (Murdoch). .. 18 Sylvanite. Ksanda)...... 203 Syromyatnikov, F. V. Mineralogy Silica minerals in submicroscopic of asbestos; Ishlryldite, a new intergrowths, x-tay deter- structural variety of chryso- mination of. (Ilurlbut)...... 727 tile.... 48 Silicates, classification of. (Ber- man). . 201 Table for polishing ores, inexpen- Silicon, simple microchemical test sive. (I{atton) 800 for. (Stables). 379 Tabulation of crystal forms and Simpson,E. S.. . 140 discussion of form names. Slawson, C. B. and Peck, A. B. (Rogers). 207 Determination of refractive Taosite. (delapparent) 678 'W. 'W. indices of minerals by the Tarr, A. and Keller, D. . immersion method. 523 Dickite in Missouri...... 109, 195 .. ...195.197 194 Smith, D. T. with Rosenholtz, I.L. Taylor, W. H.. 140 Dielectric constant of mineral Teachingmuseum, and aid to class powders. 115 instruction. (Slawson,Denny) 197 Snow structure and ski fields. Tenham, Queensland, meteoritic (Seligman)[Book review].... 676 shower of 1879 (or 1869?) Sobralite, identity with pyroxman- (Spencer) 61'2 gite. Qlenderson,Glass)..... 273 Thermophyllite.... . 463 828 TH E A M ERICA N M I N ERA LOGIST

Thiesmeyer,L. R.. . 198 Walker,T.L...... 193,196 Three-dimensional spherulites, Watson, E. H. 200 optics and structure of. Wayland, R. G. Cummingtonite (Morse,Donnay). .201,391 from Black Hills, S. Dakota. . 607 Thulite, analysis. 73 Webb, R.W. with Murdoch, J. Bus- Tilley,C. E...... 268,612 tamite from Inyo Co.,Calif.. . 69 Titanium deposits, Virginia, min- Wells.A. K..... 268 eralizationof.(Ross)...... 143,192 W'est, C. D. Immersion liquids of Toothaker, C. R.. . 196 high refractive index. . .. .194,245 Tourmaline, high iron, from Mar- Whitlock, H. P, Story of gems. quette Iron range. (Slawson) 195 [Book review]. t97 Toutmeline inclusions, oriented in 197 muscovite. (['rondel) 777 Wilcox, R. Occurrenceof large zircon Trefethen, J. M. Peculiar type of needlesin basic pegmatite... . 459 zoning in feldspar. 327 Williamsite.... 463 Tridymite. 687 Winchell, A. N. Thkd study of Trieuite.(DeLeenheer)...... 270 chlorite. ...194,642 Triplite, analysis. 656 W'olf Mountain granite, accessory Tunell,G...... 203 mineralsof. (McAdams). . 128,207 Wollastonite. 193 Ungemach,H...... 270,271,332Woodford, A. O. with F'oshag, Uraninite from Hottah Lake (anal- W. F. Bentonitic magnesian ysis).(Bruner) 265 clay-mineral. 238 Wright, F. E.. . 200 Valentinite, crystal structure of. (Buerger)...... 206 Xenoliths in the Organ batfiolith, Vanderwilt rock saw, improved. N. Mer. (Drrnham)...... ' 312 (Emigh) 670 X-ray powder ctunera. @uerger). . 11 Vaux, G. 389 Vein quartz pseudomorphousafter Yatsevitch, G. M. with Peacock, asbestiform actinolite from M. A. Cubanite from Sudbury, Blue Ridge of Fauquier Co, Ont.. . . 55 Va.(Thiesmeyer).... 198 Vesuvianite from Georgetown, Zincian amphibole from Franklin Calif.(Pabst)...... 1,213 Furnace, N.J. (Foshag). . 63 Virginia titanium deposits, miner- Zircon needles,large, in basic peg- alizationof.(Ross). l+3,192 matite. (Wilcox). 4.59 Vivianite group, crystallography Zircon, Siamese, spectrographic of.(Barth)...... 204 examination of. (Kennard, Vorhauserite. +63 Ilowell). 721 Zoningin feldspar,peculiar type of. Waldo,A. W.. . 7l (Trefethen) 327