pharmacosiderite


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pharmacosiderite

[¦fär·mə·kō′sīd·ə‚rīt]
(mineralogy)
Fe3(AsO4)2(OH)3·5H2O Green or yellowish-green mineral composed of a hydrous basic iron arsenate and commonly found in cubic crystals. Also known as cube ore.
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There the mineral is seen as thin, yellow to orange fibers and fan-shaped aggregates associated with glassy, bottle-green, fan-shaped aggregates of parasymplesite and with dark blue grains of pharmacosiderite. We found the best specimens of karibibite in the eastern part of the Oumlil mine.
At Tamdrost, lavendulan is associated with pharmacosiderite and arsenio-siderite.
The crystals, up to 0.1 mm, occur isolated and in clusters on pharmacosiderite cubes.
Small, pale greenish to pale yellowish cuboctahedral crystals of chlorargyrite under 2 mm have sometimes been found in the Dolores prospect, perched on druses of microcrystals of arseniosiderite, jarosite, conichalcite and pharmacosiderite. Common forms are {111} and {100}; rarely, crystals are twinned on {111}.
Associated minerals were olivenite, conichalcite, scorodite, erythrite, roselite, brandtite, parasymplesite, pharmacosiderite, adamite, cuproadamite, schneiderhohnite, and karibibite.
Occurrence: Associated minerals are: dolomite, calcite, aragonite, copper, cuprite, domeykite, algodonite, koutekite, gold, silver, olivenite, cornubite, clinotyrolite, connelite, brochantite, malachite, trippkeite, pharmacosiderite, strashimirite and gilmarite.
Pharmacosiderite occurs rarely as small yellow crystals at the Gambatesa mine, found in association with olivenite, and in fossil wood at the Cassagna mine, in association with copper and arsenic minerals (Palenzona, 1991).
Pharmacosiderite K[[Fe.sup.+3].sub.4][(As[O.sub.4]).sub.3][(OH).sub.4].6-7[H.sub.2]O
51 (1987), 317 Calcium Pharmacosiderite Pending (= barium pharmacosiderite) Caratiite (= piypite) Filatov and Vergasova: ZVMO 118 (3) (1989), 88 Chavesite (= monetite) Kampf and Dunn: Am.
comm.) reports finding cubic microcrystals of greenish brown pharmacosiderite with jarosite in 1978.
Other new finds from Utah include thin, bladed, centimeter-size crystals of hematite from the Creole mine, Beaver County (John Seibel Minerals); pale blue botryoidal smithsonite, calcite, rosasite, plattnerite and aurichalcite from the Hidden Treasure mine, north of Ophir, Tooele County, available from Jim McGlasson; rich purple crusts of cobaltomenite on rock from the Parco mine group, Thompson District, Grand County, and microcrystals of pharmacosiderite, metazeunerite and olivenite from the Big Indian mine, near La Sal, San Juan County (Virgin Mining).
Carbonate Zone Minor Phases Rare Phases Upper paratacamite, carrboydite, kambaldaite, annabergite, glaukosphaerite, azurite, lavendulan, hydrohonessite, retgersite, nepouite, nullaginite, pyrolusite, huntite, olivenite, otwayite, aragonite, calcite, pecoraite pharmacosiderite, [+ or -] dolomite reevesite, takovite, widgiemoolthalite Lower paratacamite, dolomite, kambaldaite huntite Weathered metabasalt immediately adjacent to the gaspeite veins in the upper carbonate zone contains only thin (0.1-5 mm) coatings of lavendulan, gypsum and minor azurite along joint planes.