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Ankerite, also known as brown spar [5]: 258 (German: braunspat) is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with the chemical formula Ca(Fe,Mg,Mn)(CO 3) 2.
Ilvaite is a sorosilicate of iron and calcium with formula: CaFe 2+ 2 Fe 3+ Si 2 O 7 O(OH). Both manganese and magnesium substitute in the structure. Ilvaite crystallizes in the monoclinic system in black prismatic crystals and columnar masses. It is black to brownish black to gray and opaque. It has a Mohs hardness of 5.5 to 6 and a specific ...
Ferberite is a black monoclinic mineral composed of iron(II) tungstate, FeW O 4. Ferberite and hübnerite often contain both divalent cations of iron and manganese, with wolframite as the intermediate species for which the solid solution series is named. [5] Ferberite occurs as granular masses and as slender prismatic crystals.
Lepidocrocite (γ-FeO(OH)), also called esmeraldite or hydrohematite, is an iron oxide-hydroxide mineral. Lepidocrocite has an orthorhombic crystal structure, a hardness of 5, specific gravity of 4, a submetallic luster and a yellow-brown streak. It is red to reddish brown and forms when iron-containing substances rust underwater.
Bixbyite is a manganese iron oxide mineral with chemical formula: (Mn,Fe) 2 O 3.The iron/manganese ratio is quite variable and many specimens have almost no iron. It is a metallic dark black with a Mohs hardness of 6.0 – 6.5. [3]
Valleriite is an uncommon sulfide mineral (hydroxysulfide) of iron and copper with ... It is an opaque, soft, bronze-yellow to brown mineral which occurs as nodules ...
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