melanterite


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Related to melanterite: copperas, sphalerite, Copiapite

melanterite

(məlăn`tərīt'): see ferrous sulfateferrous sulfate
or iron (II) sulfate,
chemical compound, FeSO4. It is known as the monohydrate, FeSO4·H2O; the tetrahydrate, FeSO4·4H2O; the pentahydrate, FeSO4·5H2
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melanterite

[mə′lan·tə‚rīt]
(mineralogy)
FeSO4·7H2O A green mineral occurring mainly in fibrous or concretionary masses, or in short, monoclinic, prismatic crystals; hardness is 2 on Mohs scale, and specific gravity is 1.90.
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References in periodicals archive ?
-- Anglesite (Pb(S[0.sub.4])) 3.1 -- Sphalerite (ZnO) -- <1.0 pyrrhotite ([Fe.sub.0.95] -- 1.4 [S.sub.1.05]) Spinel ([Mg.sub.1.01] -- 1.9 [Fe.sub.0.95][Al.sub..22] [0.sub.4]) Melanterite ((Fe, Cu, Zn) -- 1.9 S[0.sub.4] x 7[H.sub.2]0) Zincocopiapite (Zn[Fe.sub.4] -- N.Q.
White epsomite fibers occur on melanterite and chalcanthite stalactites.
Green melanterite stalactites are common throughout the mine, and rarely melanterite occurs as crystals to 2 cm.
Associated minerals are: coskreaite-(Ce), levinsonite-(Y), melanterite, halotrichite, picketingite, apjohnite, epsomite and other hydrated sulfates.
The three species are virtually indistinguishable and occur together as dull, beige, yellow and yellowish white, powdery efflorescences and crusts associated with epsomite, melanterite and fibroferrite.
Species confirmed by X-ray diffraction during this study include alstonite, anglesite, ankerite, aragonite, barytocalcite, barite, brochantite, epsomite, harmotome, hydromagnesite, jarosite, marcasite, melanterite, millerite, serpierite, siderite, sulfur and witherite.
Alum Cave Bluff, a Dana locality for apjohnite, epsomite, melanterite and potash alum, has yielded good microcrystals of several rare sulfate minerals, including three new rare-earth sulfates, and is the first North American occurrence of slavikite.
Long, deep blue stalactites in the mine workings are referred to by the miners as "chalcanthite" but in fact usually prove to be cuprian melanterite.
Eight entries in his Catalogue of Minerals Found in Colorado are: cuprite, fluorite, jamesonite, melanterite, rhodochrosite, tetrahedrite, tennantite and zinkenite.
Melanterite (?) [Fe.sup.2+]S[O.sub.4][multiplied by]7[H.sub.2]O
Melanterite FeS[O.sub.4][center dot]7[H.sub.2]O and Chalcanthite CuS[O.sub.4][center dot]5[H.sub.2]O
Typical minerals formed under these conditions are water-soluble sulfates such as chalcanthite, melanterite and halotrichite, along with other more insoluble minerals such as malachite and chrysocolla.