strengite

strengite

[′streŋ‚īt]
(mineralogy)
FePO4·2H2O A pale-red mineral crystallizing in the orthorhombic system, isomorphous with variscite and dimorphous with phosphosiderite, and specific gravity 2.87.
Mentioned in ?
References in periodicals archive ?
The Red Ball mine, Calhoun County, Alabama, was once a source of iron for Confederate cannon, and now is a source of colorful strengite, cacoxenite, beraunite, and kidwellite in earthy brown "bog iron" matrixes.
Beau Gordon (Jendon Minerals) found some excellent phosphate microcrystals at the Red Ball mine, Calhoun County, including golden yellow cacoxenite, gray-green botryoidal kidwellite, pink strengite and colorless, transparent wavellite.
Chemical microanalysis reveals that pure strengite is rare, end that most specimens have a significant component of aluminum.
Strengite forms a vitreous coating on green frondelite, and also white blebby crystals in vugs in the frondelite.
The Leveaniemi deposit in northern Sweden, renowned for violet strengite, has produced some other rare phosphates during the last few years.
The mine has produced an interesting suite of minerals in recent years, including pale blue to green aquamarine, alpine-like smoky quartz crystals, spessartine, danburite, columbite, cassiterite, helvite, and numerous phosphates including apatite, lithiophilite, purpurite, herderite, strengite, phosphosiderite, hureaulite, robertsite, eosphorite, frondelite and mitridatite (A.
Thin fracture coatings and vug linings of botryoidal, dark green to black dufrenite have been observed very rarely, associated with radial sprays of strengite, minute cubic crystals of pharmacosiderite, and local sprays of meurigite.
In acid soils, P solubility is mostly controlled by the minerals strengite ([FeSO.sub.4].2[H.sub.2]O) and variscite ([AlPO.sub.4].2[H.sub.2]O).
It occurs in partly oxidized gray orthoclase-quartzpyrite rock, following earlier strengite and followed by an unidentified green member of the rockbridgeite family (Eckel, 1997).
sub.2] Siderite Fe#C[O.sub.3] Oxides Sulfides Cassiterite Sn[O.sub.2] Bornite (Cu sulfide) [Cu#.sub.5] Fe#[S#.sub.4] Hematite [Fe#.sub.2][O.sub.3] Chalcocite [Cu#.sub.2]S# Limonite (bog iron) Fe#O(OH) Chalcopyrite CuFe#[S#.sub.2] x [H.sub.2]O (Fe sulfide) Fe#[S#.sub.2] Magnetite [Fe#.sub.3][O.sub.4] Galena PbS# Shalerite ZnS# Phosphatic Minerals Trace Elements Apatite [Ca#.sub.5](F#,Cl#) Carnotite [K#.sub.2](U[O.sub.2]) [(P#[O.sub.4]).sub.3] [(V#[O.sub.4]).sub.2] Strengite FeP#[O.sub.4] x Fluorite Ca#[F#.sub.2] 2 [H.sub.2]O Variscite AlP#[O.sub.4] x Halite (Rock Salt) NaCl# 2 [H.sub.2]O Note: Essential macro- and micronutrients are indicated with #.
Williams BG, Patrick WH Jr (1971) The effect of [E.sub.h] and pH on the dissolution of strengite. Nature Physical Science 234, 16-17.
From the Boa Vista mine (a phosphate pegmatite) in Galileia, Minas Gerais comes variscite as bright red druses of microcrystals colorfully resting on a matrix of purple strengite and other rare phosphates.