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MASCAGHINE. 535 PIG. 627. be 90° o' F 119° CO ca 90 0 00 48 52 ah 90 0 oo u 92 29 ee' 00 10 f ft O 0 112 41 uu 73 29 ss 34 44 vv' 112 22 8s" 02 48 mm 59 30 s's” 73 43 Combinations, cam, oarnv, ocaumsv, ocaumfsv. Twins. Twin-face m. Cleavage, c, imperfect; a, m, still more im perfect. Fracture conckoidal...uneven. Transparent...trans lucent. Lustre vitreous. Colourless, white, yellowish or greyish. Streak white. Father brittle, n = 2'5...3'0. g = 2'089.. .2-709. Decrepitates when heated. Before the blowpipe on charcoal in powder fuses readily into an alkaline hepar. Soluble in 1 lo parts of water at 12° o, and in 8'95 parts at ioo° c. K S, sulphuric acid 45'90, potash 54'10. Is found on Vesuvian lavas and in solution in some springs. Sulphate of potash is dimorphous. It has been observed by Mitscherlich in crystals belonging to the rhombohedral system. o m, r 100. ro = 50° o', rr' = 91° 40'. Sulphate of potash, selcniato of potash, chromate of potash, manganate of potash, and mascagnine, are isomorphous. In chrom ate of potash, kcr, chromic acid 62'40, potash 47-54, mi' = ill 0 io', mm! = 59° 56'. In seleniate of potash, kso, selenic acid 67 - 48, potash 42'54, vv/ — 111° 48''5, mm = 59° 35'. Twin crystals of chromate and seleniate of potash occur similar to those of sulphate of potash. In manganate of potash, kiih, manganic acid 62 - 24, potash 47'70. vv' = 113° o', mm = 68°49' - 6. riG. 528 367. MASCAGNINE. — Sulphate of ammonia; Phillips. Ammoniaque sufatee; llauy. Prismntisches Ainmoniak-Salz; Mohs. Mascagnin; Hausmann, llaidinger. Prismatic. 011,010 = 37° 40'; 101,001 = 30°io'; 110,100 = 80°34'. a 100, b 010, c 001, u 101, v 201, m 110, / 310, o ill. A a 4