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Erythrite
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<p>Erythrite, also known as red cobalt, previously <i><a href="/facts/Cobalt_ochre/tEULIMPr">cobalt ochre</a></i>: 172 is a secondary hydrated cobalt <a href="/facts/Arsenate_mineral/gpoxLfv8">arsenate mineral</a> with the formula Co3(AsO4)2•8H2O. Erythrite and <a href="/facts/Annabergite/5RGuxQTR">annabergite</a>, chemical formula Ni3(AsO4)2•8H2O, or <a href="/facts/Nickel/KwMCHYRP">nickel</a> arsenate form a complete series with the general formula (Co,Ni)3(AsO4)2•8H2O. </p> <p>Erythrite crystallizes in the <a href="/facts/Monoclinic/5PCwXvzX">monoclinic</a> system and forms prismatic crystals. The color is crimson to pink and occurs as a secondary coating known as <i>cobalt bloom</i> on <a href="/facts/Cobalt/gqhScEw4">cobalt</a> arsenide minerals. Well-formed crystals are rare, with most of the mineral manifesting in crusts or small reniform aggregates. </p><p>Erythrite was first described in 1832 for an occurrence in Grube Daniel, <a href="/facts/Schneeberg%2c_Saxony/JbsU9vJU">Schneeberg</a>, <a href="/facts/Saxony/PrKscwCP">Saxony</a>, and takes its name from the Greek έρυθρος (<i>erythros</i>), meaning red. Historically, erythrite itself has not been an economically important mineral, but the prospector may use it as a guide to associated <a href="/facts/Cobalt/gqhScEw4">cobalt</a> and native <a href="/facts/Silver/xXe41BGg">silver</a>. </p><p>Erythrite occurs as a secondary mineral in the oxide zone of Co–Ni–As bearing mineral deposits. It occurs in association with <a href="/facts/Cobaltite/SPvqHQ1p">cobaltite</a>, <a href="/facts/Skutterudite/0S7nBlCI">skutterudite</a>, symplesite, <a href="/facts/Roselite/KCWXhUNM">roselite</a>-beta, <a href="/facts/Scorodite/3vlSyK0h">scorodite</a>, <a href="/facts/Pharmacosiderite/xK8ubB58">pharmacosiderite</a>, <a href="/facts/Adamite/UnmAWTuj">adamite</a>, morenosite, retgersite, and <a href="/facts/Malachite/NG5p4aCv">malachite</a>. </p><p>Notable localities are <a href="/facts/Cobalt%2c_Ontario/J8MSF5oV">Cobalt, Ontario</a>; La Cobaltera, Chile, Schneeberg, Saxony, <a href="/facts/Germany/paluuWBX">Germany</a>; <a href="/facts/J%25C3%25A1chymov/G2a4pC7j">Joachimsthal</a>, <a href="/facts/Czech_Republic/vJYLD66Q">Czech Republic</a>; <a href="/facts/Cornwall/9A3TftFP">Cornwall</a>, <a href="/facts/England/U9mE5bGL">England</a>; Bou Azzer, <a href="/facts/Morocco/6ly8170M">Morocco</a>; the Blackbird mine, <a href="/facts/Lemhi_County%2c_Idaho/Cjg1M97P">Lemhi County, Idaho</a>; Sara Alicia mine, near Alamos, <a href="/facts/Sonora/cmLLIFR9">Sonora</a>, <a href="/facts/Mexico/IT5bwhdh">Mexico</a>; Mt. Cobalt, <a href="/facts/Queensland/lXBlIeY3">Queensland</a> and the Dome Rock copper mine, <a href="/facts/Mingary/lJarVlfq">Mingary</a>, <a href="/facts/South_Australia/R7UdxV97">South Australia</a>. </p>