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1CJ0 LIMESTONE FAMILY/ It occurs massive, disseminated, and crystallised in acute six-sided pyramids. Internally it alternates from glimmering to shining. The fracture is small and minute foliated, and some times curved, sometimes scaly foliated. The fragments are generally rhomboidal. It occurs in small and fine granular concretions. It is translucent, or translucent on the edges. It is semi-hard, approaching to soft. It is brittle, and easily frangible. When rubbed, it emits an urinous smell. " Specific gravity, 2.G50, John. Chemical Characters. They agree with those of the preceding subspecies: in its solution in acids, there remains a minute black-colour ed residuum. From Moscau. Carbonate of Lime, 96.50 Carbonate of Man ganese, Magne sia and Iron, 1.50 Oxide of Iron, 1.00 Lime, Alumina, Carbon, Silica, and Water, 1-00 100.00 John, Chem. Laborat. b. in. s. 90. Constituent Parts. From Garphytke. Translucent variety. Carbonate of Lime, 99.1 Carbonate of Man ganese, Magnesia and Iron, - 0.9 A trace of Carbon, and of an odorous substance. 100.0 Ilisingcr and litrzc- tiut, in Afhandlin- gar i Fysik Kemi och Mineraiogi. From Garphytt*. Black variety. Carbonate of Lime, 95.0 Carbonate of Man ganese, Magne sia and Iron, 1.5 Mixture of Alum- -slate, ami of Iron-pyritcs, as constituent parts, 3.5 100.00 Jlisinger and Btr- telius, lb. GcognoslU
