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Pharmacosiderite
A valid IMA mineral species - grandfathered
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About Pharmacosiderite
Formula:
KFe3+4(AsO4)3(OH)4 · 6-7H2O
Colour:
Pale green, green, emerald-green, dark brown, honey-yellow to yellow-brown, brownish red, hyacinth-red; green, yellow, light brown in transmitted light (biaxially sectored).
Lustre:
Adamantine, Sub-Adamantine, Sub-Vitreous, Greasy
Hardness:
2½
Specific Gravity:
2.797
Crystal System:
Isometric
Member of:
Name:
Named in 1813 by Johann Friedrich Ludwig Hausmann from the Greek φάρμăκου "pharmakou" for "poison or drug" in allusion to the arsenic content, and σίδηρος "sideros" for "iron" in its composition.
Pharmacosiderite Group.
Forms solid solutions with bariopharmacosiderite, natropharmacosiderite, pharmacoalumite and other members of the pharmacosiderite group.
A secondary mineral occurring in the oxidized zones of iron-bearing sulfide deposits or in hydrothermal deposits.
Forms solid solutions with bariopharmacosiderite, natropharmacosiderite, pharmacoalumite and other members of the pharmacosiderite group.
A secondary mineral occurring in the oxidized zones of iron-bearing sulfide deposits or in hydrothermal deposits.
Unique Identifiers
Mindat ID:
3185
Long-form identifier:
mindat:1:1:3185:7
IMA Classification of Pharmacosiderite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
KFe3+4(As5+O4)3(OH)4·6-7H2O
Lone Tree Mine, Buffalo Mountain Mining District, Humboldt County, Nevada, USA