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546 HYDHOUS SULPHATES. places in Hungary and Spain, Ilildesheim in tlie Harz, Muffling and Monchenstein in Switzerland, Sulz in Wirtemberg; on lavas; as an efflorescence on the Siberian and Caspian steppes ; in the mineral springs of Carlsbad, Sedlitz, Saidschiitz and Piillna ; in the salt lakes of Egypt. Chromate of soda, HaCr-f-iOH, is isomorphous with mirabilite. 379. ASTBAKHANITE.—Astrachanit; Hausmann. As- trakanit; Haidinger. Transparent. Colourless. Taste cooling and bitter. Efflorescent. Easily soluble in water. NaS + MgS + 4H. Analysis by G. Eose:— Sulphate of soda 41 '00 Sulphate of magnesia .... 35-18 Chloride of magnesium . . . 0'33 “Water 21'56 Gypsum mixed with sand . . 1-75 Is found in prismatic crystals below a crust of salt at the bottom of the salt lakes of Astrakhan. 380. EPSOMITE.—Sulphate of magnesia ; Phillips. Mag- nesie sulfatee ; Hauy. Prismatisches Bitter-Salz; Mohs. Bit- tersalz ; Hausmann. Epsomit; Haidinger. Prismatic. 011,010=60° 2'; 101,001=29° 43'-6; 110,l00=4o o 17'. a 100, b 010, n oil, x 021, v 101, r 201, m 110, f 210, z ill, s 121, t 211. f truncates the edge ma. The forms z, s, t are frequently hemihedral with inclined faces. ab 90° 0' zz" 63° FIG. 640. 12' nri 59 66 ZZ 78 7 / xx’ 97 35 tt’ 89 42 A »' r* vv' f 59 27 tt” 61 V V rr 98 8 ft" 103 58 *\J mm’ 89 26 8s' 41 1 X*' n z r 120 22 ss" 90 5 f H / * I / zz! 52 38 8 8" 104 18 0 Combinations, mz, mz', maz, nvzma, vzmfa, nvzxrs’f. _ .' ~j , V) ivoo } •//«•, uaccB. iiovuw»v conchoidal. Transparent... translucent. Lustre vitreous. For