AC1D1FER0US ALK.AL1NO-EARTIIY MJNE11ALS. 207 Maracaibo, disseminated at the bottom of a lake in a bed of clay, covering trona, which the natives term urao, in contradistinction to the gaylussite, the latter, from its generally elongated form, being denominated clavos or nails. (Manual.) NATIVE CARBONATE OF LIME AND SODA. Barrucl, Contains Carbonate of lime 70-0 Carbonate of soda 14-0 Water 9-7 Peroxide of iron P0 Matrix 5-0 Sp. Gr. 2-92. H. = 3-0—3-5. Primary form a rhomb, not differing materially from that of calc-spar. Cleavage in three directions parallel to the faces of the primary. Lustre vitreous ; structure laminated ; fragments per- iectly transparent; possesses double refraction. Before the blow pipe it decrepitates a little, becomes brown, and eventually is reduced to lime. Entirely soluble, and with effervescence, in nitric acid. Locality unknown. SULPHATE OF ALUMINA AND AMMONIA. Ammonalum, Nccker and llcudanl. Combination of sulphuric acid, alumina, ammonia, and water. Sulphate of alumina 37-0 36-68 g Sulphate of ammonia 18-0 12-47 Sulphate of magnesia 0-0 0-33 Water 45.O Lampadius. 43-39 Stromeyer. rimary form the cube or the regular octahedron. White as e itter. Before the blowpipe in the matrass it yields water / orms a sublimation of the sulphate of ammonia Si" watcr - Thc dri » 1be “”“ bl ” "" Bohemia* flbrous masses in tlxe lignite of Tschermig ir