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important find of gem tourmaline was made at Mount Mica in Paris, Maine, though only small quantities were...quartz-diopside rock type that consists of ab­ solutely white diopside, quartz and calcite. Sludyanka is also...Sludyanka: vanadium­ dravite, natalyite, chromphyllite (mica), magnesiocoul­ sonite (spinel), kalininite and...hydro­ thermal veins, in greisens, skarns, gneisses, mica schists and in altered volcanic rocks. Tourmaline...black, red, yellow, blue, green, color­ less to white, translucent; streak: pale brown to gray; Luster: