rhodochrosite

A Dictionary of Earth Sciences | 1999 | 700+ words | Copyright

rhodochrosite Mineral, MnCO₃; sp. gr. 3.4–3.7; hardness 3.5–4.5; trigonal; translucent rose-pink, and sometimes light grey to brown, developing a brown or black crust on exposure; white streak; vitreous lustre; crystals rare, but form as rhombohedra, and rod-like and curved, but it is usually massive or granular; cleavage perfect rhombohedral; occurs in hydrothermal veins containing silver, lead, and copper, and in metamorphic and metasomatically altered rocks of sedimentary origin, often a secondary mineral after manganese oxide; soluble, with effervescence, in hot, dilute hydrochloric acid. It is used in the manufacture of ferromanganese, being added to blast-furnace charges, and in the chemical industry.

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AILSA ALLABY and MICHAEL ALLABY. "rhodochrosite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

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AILSA ALLABY and MICHAEL ALLABY. "rhodochrosite." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-rhodochrosite.html

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