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Tennantite is a copper arsenic sulfosalt mineral with an ideal formula Cu 12 As 4 S 13. Due to variable substitution of the copper by iron and zinc the formula is Cu 6 [Cu 4 (Fe,Zn) 2]As 4 S 13. [1] It is gray-black, steel-gray, iron-gray or black in color.
Ammonium iron(III) sulfate, NH 4 Fe(SO 4) 2 ·12 H 2 O, or NH 4 [Fe(H 2 O) 6](SO 4) 2 ·6 H 2 O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt in the class of alums, which consists of compounds with the general formula AB(SO 4) 2 · 12 H 2 O. [2] It has the appearance of weakly violet, octahedrical crystals.
Barium sulfate (or sulphate) is the inorganic compound with the chemical formula Ba SO 4.It is a white crystalline solid that is odorless and insoluble in water.It occurs in nature as the mineral barite, which is the main commercial source of barium and materials prepared from it.
Cleiophane contains less than 0.1% of iron in the sphalerite crystal structure. [12] Marmatite or christophite is an opaque black variety of sphalerite and its coloring is due to high quantities of iron, which can reach up to 25%; marmatite is named after Marmato mining district in Colombia and christophite is named for the St. Christoph mine ...
As a member of the inverse spinel group, magnetite can form solid solutions with similarly structured minerals, including ulvospinel (Fe 2 TiO 4) and magnesioferrite (MgFe 2 O 4). [ 17 ] Titanomagnetite, also known as titaniferous magnetite, is a solid solution between magnetite and ulvospinel that crystallizes in many mafic igneous rocks.