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482 SOAPSTONE FAMILY. ash-grey spots, and also with bluish-grey dots, and den dritic delineations. It occurs massive, tuberose, and a shape which is in termediate between vesicular and perforated; and the walls of the vesicles are rough and uneven. Internally it is dull. The fiacture is large and flat conchoidal, which passes into even and coarse splintery. The fragments are rather sharp-edged. It is nearly opaque. It is soft : it is scratched by fluor-spar, but it scratches calcareous-spar. It feels rather meagre. It is rather easily frangible. Specific gravity, 2.881. Chemical Characters. It is infusible ; but before the blowpipe it becomes so hard as to scratch glass. Constituent Parts. Magnesia, - 4-8.00 46.00 45.42 Carbonic Acid, - 52.00 51.00 47.00 Silica, ... 4.50 Alumina, - - Trace. 1.00 0.50 Ferruginous Manganese, Trace. 0.25 0.50 Lime, . . Trace. 0.16 0.08 Water, 1.00 2.00 Bucholz. Bucholz. Bucholz. Geognostic and Geographic Situations. It is found at Jlrubschitz in Moravia, in serpentine rocks, along with meerschaum, common and earthy talc, mountain-