I S ABSTRACTS OF CHERLICAL PAPERS. M i n e r a l o g i c a l Chemistry. Glaserite from Douglashall. By H. B~~CKING (Zeit. Kryst. illin., 15,561--575).-1n the astrakanite (bloedite) of Douglashall, crystals of potassium sodium sulphate have recently been found. The crystals vary from 5 to 20 mm. in length. They have a hardness of 2$ to 3, and a sp. gr. of 2.6-50 to 2.656, the differences being due to small inclusions of rock-salt. The crystals belong to the hexagonal system, the axial rat,io being a : c = 1 : 1.2879. These samples of crystals, easily soluble in water, gave on analysis the following results :- K2S04. N+S04. MgSO,. NaC1. Insol. H20 and loss. Total. I. 66.5 22.0 - 10.1 0.4 1.0 100.0 11. 67.3 18.2 - 21.6 - 2.9 100.0 111. 58-7 19.5 3.4 14.4 0.1 3.9 100.0 The author also gives crystallographical descriptions of bloedite, Atelestite from Schneeberg, in Saxony.By K. Busz (Zeit. R r y s t . Min,., 15, 625-627).-A specimen of this rare mineral from the Neuhilfe mine, at Schneebei-g, gave on analysis results corre- sponding with the formula As2O5,3Bi2O3,2Hz0. The axial ratio was calculated by G. v. Rath to be a : b : c = 0.869 : 1 : 1.822, p = 110" 30'; whilst the author finds that it is kainite, and boracite from the same locality. B. H. B. a : b : c = 0.92974 : 1 : 1.51227. /3 = 110" 23'. The hardness is 3$, and the sp. gr. 6.4. B. H. B. Artificial Preparation of Wollastonite. By -4. GORGEG (Zeit. K r y s t . iiin., 15, 646; from Bull. SOC. fmn. win., 10, 271).-One equivalent of CaC12 melted with one equivalent of precipitated silica, in the presence of steam, gives CaSiOj, whilst two equivalents of the former give Can,SiO,, which, however, cannot be isolated in distii;ct crptals. With a larger excess of calcium chloride, the compound Ca,C12SiOs is obhinqd in rhombic crystals and pseudo-MINERALOGICAL CHEMISTRY.19 hexagonal tablets, whose composition is probably Ca2C12Si03. If 1 gram of Si02, 15-grams of CaCl,, and 3 grams of NaCl are melted for half an hour in a current of moist air there is obtained, besides small quantities of the chlorides mentioned above and of tridymite, long prisms of wollastonite exhibiting the optical properties of the natural mineral. B. H. B. Anorthite and Enstatite. By K. v. CHROUSTSCHOFF (Zeit. I h y ~ t . &fin., 15, 649; from BulZ. Xoc.j?an. rnin., 10, 329).-The olivine inclusions in the basalt of Wingendorf, in Silesia, contain anorthite (I) and almost colourless enstatite (11). Both minerals were isolated and analgsed with the following results :- SiO,. A120,. Fe,O,. FeO. MgO. OaO. Na,O. K20. Ignition. Total. I. 44-68 35.32 0.41 - 1.13 17.45 1.33 0.45 0.33 101.10 11. 56.96 0.79 - 3.21 33.65 4.32 traces 0.26 99.09 B. H. B. Minerals from Fiskernas, in Greenland. By N. V. USSIN (Zeit. Kryst. Mim, 15, 396-615) .-1. Sapphirim.--The sapphirine- bearing rock belongs to the crystalline schist series. The sapphirine occurs in blue, tabular crystals, with distinct pleochroism. The axial ratio is calculated to be a : b : c = 0.65 : 1 : 0.93 . /3 = 79" 30'. The hardness of sapphirine is 7+, and its sp. gr.is 3.486. Analysis gave the following results :- Si02. A1203. Fe203. FeO. MgO. Ignition. Total. 12-83 65.29 0.93 0-65 19.78 0.31 99.79 Formula : Mg5A112Si2027. 2. KorrLerupine.-This was described as a new mineral by Lorenzen. No crystallographical and optical examination has hitherto been made. The mineral belongs to the rhombic system, the axial ratio being a : b = 0.854 : 1. It is perhaps identical with the prisniatine of Sauer. 3. Gedrite.-This mineral is found at Fiskernas in colonrless grains or short prisms, having a hardness OF 5.5 and a sp. gr. of 3.100. Analysis gave the following results :- Its formula is MgA1,SiOs. SiO,. A120,. Fe203. FeO. MgO. Na,O. H20. Total. 46.18 21-78 0.44 2-77 25.05 2-30 1-37 99.89 Formula : (NaE),Si03,6MgSi0,,2A1,0,. This variety of gedrite differs from all other rhombic amphiboles by its high percentage of alumina.4. Paqasite.-This monosymmetric hornblende o6cnrs in small, transparent grains, having a sp. gr. of 3.064, and giving on anal-+- 46.79 15.36 0.69 2-38 13-11 20-17 2*1:3 100*C;3 SiO,. A1,0,. Cr203. PeO. CeO. MgO. Ignition. Total. B. H. B. c 220 ARSTHACTS OF CEEMICAL PAPERS. Artificial Fayalite. By A. FIRKET (Zeit. Kryst. Min., 15, 6.52-6rj3; from Ann. Xoc. gebl. Belg., 14, 196).-A slag from the OugrBe ironworks analysed by the author gave the following results :- SiOz. FeO. Fe,O,. MnO. S. I?. Total. 28.00 62 00 9.30 0.97 0.14 0.50 100.91 The hardness is 6, and the sp. gr. 4.812. B. H. B.I S ABSTRACTS OF CHERLICAL PAPERS.M i n e r a l o g i c a l Chemistry.Glaserite from Douglashall.By H. B~~CKING (Zeit. Kryst. illin.,15,561--575).-1n the astrakanite (bloedite) of Douglashall, crystalsof potassium sodium sulphate have recently been found. Thecrystals vary from 5 to 20 mm. in length. They have a hardness of2$ to 3, and a sp. gr. of 2.6-50 to 2.656, the differences being due tosmall inclusions of rock-salt. The crystals belong to the hexagonalsystem, the axial rat,io being a : c = 1 : 1.2879. These samples ofcrystals, easily soluble in water, gave on analysis the followingresults :-K2S04. N+S04. MgSO,. NaC1. Insol. H20 and loss. Total.I. 66.5 22.0 - 10.1 0.4 1.0 100.011. 67.3 18.2 - 21.6 - 2.9 100.0111. 58-7 19.5 3.4 14.4 0.1 3.9 100.0The author also gives crystallographical descriptions of bloedite,Atelestite from Schneeberg, in Saxony.By K. Busz (Zeit.R r y s t . Min,., 15, 625-627).-A specimen of this rare mineral fromthe Neuhilfe mine, at Schneebei-g, gave on analysis results corre-sponding with the formula As2O5,3Bi2O3,2Hz0. The axial ratio wascalculated by G. v. Rath to be a : b : c = 0.869 : 1 : 1.822, p =110" 30'; whilst the author finds that it iskainite, and boracite from the same locality. B. H. B.a : b : c = 0.92974 : 1 : 1.51227. /3 = 110" 23'.The hardness is 3$, and the sp. gr. 6.4. B. H. B.Artificial Preparation of Wollastonite. By -4. GORGEG (Zeit.K r y s t . iiin., 15, 646; from Bull. SOC. fmn. win., 10, 271).-Oneequivalent of CaC12 melted with one equivalent of precipitatedsilica, in the presence of steam, gives CaSiOj, whilst two equivalentsof the former give Can,SiO,, which, however, cannot be isolated indistii;ct crptals. With a larger excess of calcium chloride, thecompound Ca,C12SiOs is obhinqd in rhombic crystals and pseudoMINERALOGICAL CHEMISTRY.19hexagonal tablets, whose composition is probably Ca2C12Si03. If1 gram of Si02, 15-grams of CaCl,, and 3 grams of NaCl are meltedfor half an hour in a current of moist air there is obtained, besidessmall quantities of the chlorides mentioned above and of tridymite,long prisms of wollastonite exhibiting the optical properties of thenatural mineral. B. H. B.Anorthite and Enstatite. By K. v. CHROUSTSCHOFF (Zeit. I h y ~ t .&fin., 15, 649; from BulZ. Xoc. j?an. rnin., 10, 329).-The olivineinclusions in the basalt of Wingendorf, in Silesia, contain anorthite(I) and almost colourless enstatite (11).Both minerals were isolatedand analgsed with the following results :-SiO,. A120,. Fe,O,. FeO. MgO. OaO. Na,O. K20. Ignition. Total.I. 44-68 35.32 0.41 - 1.13 17.45 1.33 0.45 0.33 101.1011. 56.96 0.79 - 3.21 33.65 4.32 traces 0.26 99.09B. H. B.Minerals from Fiskernas, in Greenland. By N. V. USSIN(Zeit. Kryst. Mim, 15, 396-615) .-1. Sapphirim.--The sapphirine-bearing rock belongs to the crystalline schist series. The sapphirineoccurs in blue, tabular crystals, with distinct pleochroism. The axialratio is calculated to be a : b : c = 0.65 : 1 : 0.93 . /3 = 79" 30'. Thehardness of sapphirine is 7+, and its sp. gr. is 3.486. Analysis gavethe following results :-Si02.A1203. Fe203. FeO. MgO. Ignition. Total.12-83 65.29 0.93 0-65 19.78 0.31 99.79Formula : Mg5A112Si2027.2. KorrLerupine.-This was described as a new mineral by Lorenzen.No crystallographical and optical examination has hitherto beenmade. The mineral belongs to the rhombic system, the axial ratiobeing a : b = 0.854 : 1. It is perhapsidentical with the prisniatine of Sauer.3. Gedrite.-This mineral is found at Fiskernas in colonrlessgrains or short prisms, having a hardness OF 5.5 and a sp. gr. of 3.100.Analysis gave the following results :-Its formula is MgA1,SiOs.SiO,. A120,. Fe203. FeO. MgO. Na,O. H20. Total.46.18 21-78 0.44 2-77 25.05 2-30 1-37 99.89Formula : (NaE),Si03,6MgSi0,,2A1,0,. This variety of gedritediffers from all other rhombic amphiboles by its high percentage ofalumina.4. Paqasite.-This monosymmetric hornblende o6cnrs in small,transparent grains, having a sp. gr. of 3.064, and giving onanal-+-46.79 15.36 0.69 2-38 13-11 20-17 2*1:3 100*C;3SiO,. A1,0,. Cr203. PeO. CeO. MgO. Ignition. Total.B. H. B.c 20 ARSTHACTS OF CEEMICAL PAPERS.Artificial Fayalite. By A. FIRKET (Zeit. Kryst. Min., 15,6.52-6rj3; from Ann. Xoc. gebl. Belg., 14, 196).-A slag from theOugrBe ironworks analysed by the author gave the followingresults :-SiOz. FeO. Fe,O,. MnO. S. I?. Total.28.00 62 00 9.30 0.97 0.14 0.50 100.91The hardness is 6, and the sp. gr. 4.812. B. H. B