Pharmacosiderite is a hydrated basic ferric arsenate, with chemical formula KFe4(AsO4)3(OH)4·(6-7)H2O and a molecular weight of 873.38 g/mol. It consists of the elements arsenic, iron, hydrogen, potassium, sodium and oxygen. It has a Mohs hardness of 2 to 3, about that of a finger nail. Its specific gravity is about 2.7 to 2.9, has indistinct cle...
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http://en.wikipedia.org/wiki/Pharmacosiderite
• (n.) A hydrous arsenate of iron occurring in green or yellowish green cubic crystals; cube ore.
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http://thinkexist.com/dictionary/meaning/pharmacosiderite/
hydrated iron arsenate mineral (KFe3+4(AsO4)3(OH)467H2O) that forms olive-green to honey-yellow, yellowish-brown, and brown, transparent to ...
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http://www.britannica.com/eb/a-z/p/54
Phar`ma·co·sid'er·ite noun [ Greek ... drug, poison + English
siderite .]
(Min.) A hydrous arsenate of iron occurring in green or yellowish green cubic crystals; cube ore.
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http://www.encyclo.co.uk/webster/P/70
Pharmacosiderite is a secondary mineral formed through the oxidation of pre-existent arsenic-bearing minerals such as arsenopyrite. It is also commonly found associated with goethite, pyrite, realgar and scorodite. Pharmacosiderite was confirmed as a distinct species in 1813.
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http://www.probertencyclopaedia.com/browse/HP.HTM
(Hydrated Potassium Iron Arsenate Hydroxide) Pharmacosiderite is a rare secondary arsenate mineral. It typically forms in the oxidation zones of ore deposits. Pharmacosiderite forms from the alteration of arsenopyrite , tennantite and other primary arsenic minerals, and to a much rarer extent, it forms directly from precipit...
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https://www.encyclo.co.uk/local/23719
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