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RHODOCHROSITE

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Originally appearing in Volume V23, Page 269 of the 1911 Encyclopedia Britannica.
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RHODOCHROSITE , a See also:

mineral See also:species consisting of See also:manganese carbonate, MnCO3, crystallizing in the See also:rhombohedral See also:system and isomorphous with See also:calcite. It usually occurs as cleavable, compact or botryoidal masses, distinct crystals being somewhat rare; these often have the See also:form of the See also:primitive rhombohedron, parallel to the faces of which there are perfect cleavages. When pure, the mineral contains 47.7% of manganese, but this is usually partly replaced by varying amounts of See also:iron, and sometimes by See also:calcium, See also:magnesium, See also:zinc, or rarely See also:cobalt (cobalt-manganese-spar). With these See also:variations in chemical See also:composition the specific gravity varies from 3.45 to 3.6o; the hardness is 4. The See also:colour is usually See also:rose-red, but may sometimes be See also:grey to See also:brown. The name rhodochrosite, from the See also:Greek /Soso-xptes (rose-coloured), has reference to the characteristic colour of the mineral: manganese-spar and dialogite are synonyms. It is found in mineral See also:veins with ores of See also:silver, See also:lead, See also:copper, &c., or in' deposits of manganese ore. Crystals have been met with in the mines at Kapnik-Banya and Nagyag near See also:Deva in Transylvania and at See also:Diez in See also:Nassau, but by far the best specimens are from See also:Colorado. The mineral is used to a limited extent in the manufacture of spiegeleisen and ferromanganese.

End of Article: RHODOCHROSITE

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