Volltext Seite (XML)
MIEABILITE. 545 Red oxide of iron . . . 974 9 - 80 40'08 Water 41-69 4i'70 40'13 Gangue and loss .... 072 071 i ll It is found in soft drops, which are gradually dried into hom-like masses, in the alum shale works at Garnsdorf near Saalfeld in Thuringia, and at Reichenbach in Saxony. 378. MIRABILITE.—Sulphate of soda; Phillips. Soude sulfatee ; Hauy. Prismatisches Glauber-Salz ; Mohs. Glau- bersalz ; Hausmann. Mirabilit; Haidinger. Oblique. 101,100 = 67° 65'; 111,010 = 46° 36'; 101,001 =49° 50'. a ioo, b oio, c ooi, e oil, r 101, I 201, to 201, OT 110, v 120, n ill, d 111, y 211. be 90° 0' mb ah 90 0 mm ca 107 45 vv lc 75 19 yl la 32 26 yij rc 49 50 nr ra 67 55 nn toe 47 66 ed tod 24 19 dd' ma 49 41 Combinations, amec, nameeb, nmraecb, nmawecb, Irnyamvd- toecb. Twins. Twin-face c. Cleavage, c, very perfect and easily obtained ; a, b, faint traces. Fracture conchoidal. Trans- ~~ 1 parent. Lustre vitreous. R = 1'44. The optic axes lie in R plane perpendicular to the face b, making an angle of 12° 24' with a normal to a, and an angle of 11° 65' with a normal to to'. The optic axes make angles of 40° 13' with a normal to b. Colourless, white. Streak white. Sectile. 11 = 1-5...2 - 0. o = 1-481. Taste cooling, bitter. NaS + 10II, sulphuric acid 24-86, soda 19-24, water 66 - 9l. Melts in the matrass. Before the blowpipe on charcoal melts and is converted into an alkaline hepar. Effloresces Khen exposed to dry air. At 0° 0 is soluble in 10 parts of water; at 33° 0 in 0-33 parts of water. In crystals formed in the winter in salt springs; as an efflo rescence on the soil, and on the shores of salt lakes ; dissolved m mineral waters. Is found at Aussee, Ischel and Ilallstadt in Austria, Ilallein near Salzburg, Eger in Bohemia, Hall in the Tyrol, in several 0 0 19 80 38 45 59 30 54 118 12 43 24 93 12 86 31 110 42 FIG. 639.