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Selenite. 569 Maflive varieties are fometimes unfeparated, fome- times Ihew large, coarfe, final), and fine grained con- .cretions. Surface of the concretions is genera yvery uneven. Completely tranfparent. Very foft. Very mild. A little commonly flexible. ^ ^ Eaflly fplit in the direction of the principal fracture. Not particularly eaflly frangible. Not particularly heavy approaching to light. Specific gravity— Constituent Parts. Lin>e Sulphuric acid Water S° 47 ax According to Bergman. Geognosilc Situation.