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Miner Alogic A1 Cherni Str Y View Article Online / Journal Homepage / Table of Contents for this issue ii. 418 ABSTRACTS OF CHEMICAL PAPERS. Miner alogic a1 Cherni s t r y. A Danger to be Guarded Against in Making Mineral Separations by means of Heavy Solutions. WILLIAMF. Published on 01 January 1913. Downloaded 27/10/2014 18:33:35. HILLEBRAND(Arner. J. Sci., 1913, [ivJ, 35, 439-440).-It has long been known that certain minerals, especially metallic minerals, are acted on and decomposed by Sonstadt's (potassium-mercuric iodide) and Klein's (cadmium boro-tungstate) solutions. In the case now recorded there has been a replacement of calcium by an equivalent amount of potassium without the mineral being visibly affected. The material under examination was a canary-yellow, crystallised mineral, supposed to be carnotite, from Paradox Valley, Montrose Co., Colorado. It is a hydrous vanadate of calcium and uranium, differing from carnotite in containing calcium in place of potassium. This calcium carnotite is probably identical with the tuyamunite of Nenadkevich (Bull. Acad. Isci. St. Pe'torsbourg, 1912, 945). By the action of Sonstadt's solution it is converted into ordinary carnotite with a decrease in the optic axial angle of 25O. Anal. I is of the untreated mineral, and I1 of another portion which had been treated for eighteen hours with Sonstadt's solution : H,O V,O,. UO,. CaO. K,O. CuO." SiO,,P,O,,BaO, etc. and loss. I. 18.03 53-71 5-20 0.24 4-16 2-45 16'21 11. 18'31 55-37 1.72 6-08 4.22 1'91 12.39 * Copper, and possibly some of the calcium, preseut in an intermixed greenish v aiiada te. L. J. S. View Article Online MINERALOGICAL CHEMISTRY. ii. 419 Helium in Glucinum Minerals. AHNALUOPiuT1-r (Atti Zl. Accad. Lincei, 1913, [v], 22, i, 140--144).--The author has examiiied twenty-six minerals containing gluciiium, but not radioactive, as to the amount of helium they contain. Taking into account the geological age of the various formations in which the specimens occurred, it is not possible to find any relationship between the amount of helium and the age of the mineral. Considerable variations also occur among the samples from the same locality. The beryls contain usually more helium than the chrysoberyls, whilst the phenacite (Gl,SiO,) examined did not contain any. This observation excludes the possibility of the derivation of helium from glucinum. R. V. S. Natural Thio-salts. I. The Plagionite Group. FER~WCCIO ZAMBONINI(C'hem. Zeiztrr., 1913, i, 739 ; from Rev. Min. Crist. Ittaliam, 1912, 41, 1-38).-A new source of plagionite is the Veta purissima pit in Oruro, Bolivia, where it is accompanied by crystalline and massive pyrites and lead-coloured clusters of needles or fibrous aggregates of meneghinite (jamesonite ?), a transformation product of plagionite. The plagionite occurs in lead-coloured, lustrous lamell=, and rarely in single crystals, with a : b : c 1.1305 : 1: 0.8422, P=107O15/. It has D1* 5.54, and its analysis agrees with 5PbS,4Sb2S,. Spencer (Min. Mag., 1909, 14, 308) expected that plagionite, heteromorphite, and semseyite would form a morphotropic group in which the PbS content increased by two molecules from step to step. A consideration of the best analyses and of the crystallo- graphic constants, densities, and molecular volumes of the extreme members, however, leads the author to consider the plagionite group Published on 01 January 1913. Downloaded 27/10/2014 18:33:35. as a series of solid solutions of the end salts 5PbS,4Sb,S3, plagionite, and 5PbS,2Sb2S3, samseyite. J. C. W. Bauxite or Sporogelite 3 CORNELIUSDOELTER and EMIL DITTLEI~(Crntr. Mi%., 1913, 193-194. Compare A., 1912, ii, 357; 1913, ii, 230).-The name sporogelite has recently been proposed by Ki6patic (this vol., ii, 64, 69) for the colloidal aluminium hydroxide which forms an important constituent of bauxite. The present authors prefer, however, to retain the old name bauxite for this constituent, and to refer to the mixture of minerals (that is, a rock) as bauxitite. It is urged that a definite formula (Al,O,,H,O) cannot be assigned to this mineral, but that, corresponding with the colloidal nature, the water may be variable in amount. L. J. S. Delafossite, a Cuprous Mstaferrite from Bisbee, Arizona. AUSTINF. ROGERS[with analysis by G. S. BOHART] (Amerr. J. Sci., 1913, [iv], 35, 290--294).-The mineral is found as indistinct, platy crystals on hzmatite, and occurs together with native copper and cuprite in clay at the lowest zone of oxidation in the Calumet and Arizona mine. The crystals are rhombohedra1 (a : c = 1 : 1*94), with a black colour and streak and a metallic lustre; H =5+. They are nonmagnetic and easily fusible, and readily soluble in hydrochloric acid and sulphuric acid, but not in nitric acid. A soft, black, View Article Online ii. 420 ABSTRACTS OF CHEMICAL PAPERS. graphite-like form with lamellar structure also occurs. Analysis gave : CU. Fe. Insol. (hEmatite). 0. Total. 41’32 37.26 0’21 [21-21] 100*00 The ratios are very closely Cu : Fe: O= 1 : 1 : 2, and the formula may be written as Cu’Fe’/’O,, cuprous metaferrite, or as Cu”Fe”O,, cupric hypoferrite. Qualitative tests show the presence of both ferrous and ferric iron; but it is pointed out that mixed solutions of cupric sulphate and ferrous sulphate react in the same manner. The first formula is regarded as the more probable. The well-known metaf errites (magnetite, FeFe,O,, etc.) of the spinel group are cubic in crystallisation ; but the artificial sodium metaferrite, NaFeO,, is rhombohedra1 and perhaps isomorphous with delaf ossite. The mineral delafossite was first described from Siberia by Friedel in 1873, and it has hitherto been looked on as a doubtful species. L. 5. S. Ghromitite. MILORAD2 JOV~TSCXITSCH(Bull. SOC. fray. Mime, 1912 [Le. 19131, 35, 511--516).--Annlysi~ I. is of the bl;tck band, to which the name chromitite was given (A+,1909, ii, 246), from the streams on the mountain Kopaonik, in Servia; and II-V of grains of the same mineral (I1 and 111, dark brittle grains; IV and V, brighter and more resistant) isolated from a weathered mica-schist occurring in this district, and which is therefore to be regarded as the parent rock of the mineral chromitite: Fe,O,. Al,O,. Cr,O,. CaO. MgO. Total. I. 30.59 6-23 59-68 1-25 8 -89 101 ‘64 11. 26.39 6.47 61’58 1’45 3-34 99’23 111. 27’13 877 61-35 1’21 3.10 101’56 22‘83 8’45 63 37 1 -35 2.98 98.98 Published on 01 January 1913. Downloaded 27/10/2014 18:33:35. IV. V. 25-14 10.77 61.36 1 -04 3 ‘65 101-96 These analyses give the formula (Fe,A1)203,2Cr,03,differing from tha.6 previously given, namely, Fep03,Clr,0,. Chrome iron-ores which contain some ferric oxide may be regarded as mixtures of chromite, (Fe,Mg)(Cr,Fe,Al),O,, and chromitite, Fe,Cr,09. L. J. S. Titaniferous Magnetite in the Basalt of Eresztevhy, Hungary. ALADBR VENDL(Foldt. Kozl., 1912, 42, 9 11-9 12, 958---959).-A mineral occurring in the basalt of Eresztevhny in the Medves Mountains, as black grains with a bright metallic lustre on its conchoidal fracture, has been referred to as ilmenite (“ Titaneisen ”). It is, however, strongly magnetic, and the follow- ing analysis proves it to be really a titaniferous magnetite: TiO,. SiO, FeO. Fe,O,. Mn,O,. Total. 6-58 trace 38.32 53-68 1 *03 99.61 L. J. S. Two Varieties of Calciovolborthite (3) from Utah. WILLIAM F. HILLEBRANDand HERBERT E. MERWIN (Amer. J. Sci.,1913, [iv], 35, 441445).-The minerals described occur as thin encrustations, View Article Online MINERALOGICAL CHEMISTRY. ii. 421 together with other copper minerals, on sandstone near Richardson, in the canyon of Grand River, S.E. Utah. Both of them have the form of rosettes and patches of minute reticulated scales, and they are sometimes present together on the same hand-specimens. Only very limited amounts of impure material, consisting of scrapings from the sandstone surfaces, were available for examination. Analysis I (after deducting 30.6% of material insoluble in very dilute nitric acid) is of the yellowish-green variety. The optical characters of this indicate that the scales are probably monoclinic ; and they show very strong inclined dispersion. Analysis I1 is of the greenish-yellow variety, which is probably pseudomorphous after the yellowish-green mineral. No definite formulae can be deduced from these analyses. I is a hydrous vanadate of copper, and I1 a hydrous arsenuvanadat.e of copper and calcium : H20 H2O V205. 8~205.Pz05. CuO. CaO. BaO. MpO. K20,Na20. (105").(>105").CO2.Si02. Fez03. Total. I. 30.6 1'1 0'3 48.4 3.9 2.7 0'3 0-7 1'8 6 4 2'4 0.6 0.8 100'0 11." 16'0 17'2 0'8 37'1 15.3 2.3 0'5 0-2 1'0 4'3 0.9 0.7 0-5 100'0 * Also manganese, cobalt, and aluminium oxides, 3'2. Very similar specimens have also been found in Paradox Valley, Montrose Co., Colorado. L. J. S. Datolite from Mt. Mashuk, Caucasus. NIEOLAIA. ORLOV (Juhvb. Min., 1913, i, Ref. 38 ; from ATLWGiol. Min. Russ'L'o,191 1, 13, 1'46--1448).-Previous analyses of the massive black mineral from this locality, near Pyatigorsk, did not lead to its correct identifi- cation, owing to the presence of impurities in considerable amount (A., 1912, ii, 950).
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