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Akaganeite, also written as the deprecated Akaganéite, [2] is a chloride-containing iron(III) oxide-hydroxide mineral, formed by the weathering of pyrrhotite (Fe 1−x S). Akaganeite is often described as the β phase of anhydrous ferric oxyhydroxide FeOOH , but some chloride (or fluoride ) ions are normally included in the structure, [ 3 ] so ...
Trevorite is a rare nickel iron oxide mineral belonging to the spinel group.It has the chemical formula NiFe 3+ 2 O 4.It is a black mineral with the typical spinel properties of crystallising in the cubic system, black streaked, infusible and insoluble in most acids.
Todorokite is dark brown to brownish black in color and brown in transmitted light. [7] It has a black to dark brown streak [ 6 ] [ 8 ] and the luster is metallic to dull, but silky in aggregates. It is opaque in all but the thinnest slivers, which are transparent.
Andradite is a mineral species of the garnet group.It is a nesosilicate, with formula Ca 3 Fe 2 Si 3 O 12.. Andradite includes three varieties: Colophonite: a historical variety found in the Scandinavian islands, brownish or reddish in color, often opaque or translucent.
Raw umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2 O 3 + MnO 2 + n H 2 O + SiO 2 + Al 2 O 3. When calcined (heated) it is referred to as burnt umber and has more intense colors. Raw sienna (PBr7): a naturally occurring yellow-brown pigment
Brookite is usually brown in color, sometimes yellowish or reddish brown, or even black. Beautiful, deep red crystals (seen above-right) similar to pyrope and almandite garnet are also known. Brookite displays a submetallic luster. It is opaque to translucent, transparent in thin fragments and yellowish brown to dark brown in transmitted light ...
Bismuth germanium oxide or bismuth germanate is an inorganic chemical compound of bismuth, germanium and oxygen. Most commonly the term refers to the compound with chemical formula Bi 4 Ge 3 O 12 ( BGO ), with the cubic evlitine crystal structure , used as a scintillator .
A rare variety of hornblende contains less than 5% of iron oxide, is gray to white in color, and is named edenite from its locality in Edenville, Orange County, New York. Oxyhornblende is a variety in which most of the iron has been oxidized to the ferric state, Fe 3+. Charge balance is preserved by the substitution of oxygen ions for hydroxide.