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Crocoite

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crocoite [′kräk·ə‚wīt]
(mineralogy)
PbCrO4A yellow to orange or hyacinth-red secondary mineral occurring as monoclinic, prismatic crystals; it is also massive granular. Also known as crocoisite; red lead ore.
Crocoite 

a mineral of chemical composition Pb[CrO4] (69.06 percent PbO, 30.94 percent CrO3). It sometimes contains admixtures of silver and zinc. Crocoite crystallizes in the mono-clinic system, forming slender prismatic or acicular crystals of a bright orange-red color. It is brittle, with a mineralogical hardness of 2.5–3.0 and a density of 5,990–6,000 kg/m3. Crocoite is formed in the oxidized zone of polymetallic lead-zinc ore deposits occurring in ultrabasic rocks (chromium sources) or in their immediate vicinity. The best-known variety of crocoite is extracted from the Berezov deposit in the Urals; it forms crystal druses in beresovite fissures. Other crocoite deposits are located in Tasmania.
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Chromium oxide was discovered as being a part of crocoite, better known as red lead, which is actually lead chromate, sometimes containing some molybdate and perhaps vanadium.
Did You Know the Trace Element Chromium Could Help Your Body?s Cells ... by Darrell Miller / Food/cooking/nutrition community
Conservators had noticed that some paintings using crocoite have become discolored, but researchers hadn't pinned down the cause.
Living history: cultural artifacts are crawling with damaging microbes by Brownlee, Christen / Science News
 
 
 
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