Osumilite
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Osumilite is a very rare potassium-sodium-iron-magnesium-aluminium silicate mineral. Osumilite is part of the milarite group (also known as the milarite-osumilite group) of cyclosilicates.
Characteristics
Osumilite chemical formula is Template:Chem2.[1][2] It is translucent and the typical coloring is either blue, black, brown, or gray. It displays no cleavage and has a vitreous luster. Osumilite has a hardness between 5-6 on the Mohs hardness scale.[3]
The hexagonal crystal structure of osumilite is an unusual molecular make-up. The primary unit is a double ring, with a formula of Template:Chem2. Normal cyclosilicate have rings composed of six silicate tetrahedrons; Template:Chem2. In a double ring structure, two normal rings are linked by sharing six oxygens, one from each tetrahedron in each six membered ring.[4]
Occurrence
Osumilite, was first discovered as grains in volcanic rocks near Osumi, Japan. It was confused with a similar mineral cordierite because of their similar coloring. It can be found in high-grade metamorphic rocks, xenoliths and in the groundmass of rhyolite and dacite.[5]
Osumilite is found in the Obsidian Cliffs, Oregon; Sardinia, Italy; Kagoshima and Yamanashi Prefecture, Japan; and the Eifel district in Germany.[5] Osumilite pseudomorphs are known from a number of ultrahigh-temperature rocks, including those of southern Madagascar.
See also
References
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- ↑ Don S. Goldman, George R. Rossman (1978): The site distribution of iron and anomalous biaxiality in osumilite, In: American Mineralogist, 63, S. 490-498 ((PDF, 961 kB)Script error: No such module "Unsubst".)
- ↑ E. Olsen, T. E. Bunch (1970): Compositions Of Natural Osumilites, In: The American Mineralogiste, 55, S. 875 - 879 ((PDF, 328 kB))
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- ↑ http://www.galleries.com/minerals/silicate/osumilit/osumilit.htm Mineral Galleries
- ↑ a b http://www.handbookofmineralogy.org/pdfs/osumilite.pdf Handbook of Mineralogy
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