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Gormanite is a phosphate mineral with the formula (Fe,Mg) 3 Al 4 (PO 4) 4 (OH) 6 ·2H 2 O. It was named after the University of Toronto professor Donald Herbert Gorman (1922–2020). Occurrence
Gummite from collection of Prague National Museum. Gummite is a yellow amorphous mixture of uranium minerals, oxides, silicates, and hydrates of uranium, derived from the alteration of uraninite.
Cummingtonite is used to describe minerals of this formula with between 30 and 70 per cent Fe 7 Si 8 O 22 (OH) 2. Thus, cummingtonite is the series intermediate. Manganese also substitutes for (Fe,Mg) within cummingtonite amphibole, replacing B site atoms.
Serpentine minerals are polymorphous, meaning that they have the same chemical formulae, but the atoms are arranged into different structures, or crystal lattices. [7] Chrysotile , which has a fibrous habit , is one polymorph of serpentine and is one of the more important asbestos minerals.
The minerals present in a granulite will vary depending on the parent rock of the granulite and the temperature and pressure conditions experienced during metamorphism. A common type of granulite found in high-grade metamorphic rocks of the continents contains pyroxene , plagioclase feldspar and accessory garnet , oxides and possibly amphiboles .
Goethite (/ ˈ ɡ ɜːr t aɪ t /, [6] [7] US also / ˈ ɡ oʊ θ aɪ t / [8] [9]) is a mineral of the diaspore group, consisting of iron(III) oxide-hydroxide, specifically the α-polymorph. It is found in soil and other low-temperature environments such as sediment.
Chlorite minerals show a wide variety of compositions, in which magnesium, iron, aluminium, and silicon substitute for each other in the crystal structure. A complete solid solution series exists between the two most common end members, magnesium-rich clinochlore and iron-rich chamosite .
Pages in category "Germanium minerals" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. A. Argutite; Argyrodite; B.