Moganite
| Moganite | |
|---|---|
| General | |
| Category | Silicate mineral |
| Formula (repeating unit) | SiO2 |
| Strunz classification | 04.DA.20 |
| Dana classification | 75.01.04.02 |
| Crystal system | Monoclinic - prismatic (2/m) |
| Identification | |
| Colour | Grey |
| Crystal habit | Massive |
| Mohs scale hardness | 6 |
| Luster | Earthy, dull |
| Streak | White |
| Diaphaneity | Transparent |
| Optical properties | Biaxial |
| Refractive index | nα = 1.524 nγ = 1.531 |
| References | [1][2] |
Moganite is a silicate mineral with the chemical formula SiO2 (silicon dioxide) that was discovered in 1984.[1] It crystallises in the monoclinic crystal system. Moganite is considered a polymorph of quartz: it has the same chemical composition as quartz, but a different crystal structure.[2]
In 1994, the International Mineralogical Association (IMA) had disapproved it as being a separate species because it was not clearly distinguishable from quartz.[3] It has only recently (2007) been approved as a valid species by the CNMNC, the Commission on New Minerals, Nomenclature and Classification (part of the IMA).[4]
This mineral has been mainly found in dry locales such as Gran Canaria and Lake Magadi.[5] It has been reported from a variety of locations in Europe, India and the United States.[1] It was named for the municipality of Mogán on Gran Canaria.[2] Physically, it has a hardness of about 6, a dull luster and appears gray in color but transparent.
References
- ^ a b c Ralph, Jolyon, and Ida Ralph. "Moganite: Moganite Mineral Information and Data." MinDat. 2007. Aug. 2007 <http://www.mindat.org/min-2739.html>.
- ^ a b c http://webmineral.com/data/Moganite.shtml Webmineral data
- ^ Origlieri, Marcus. "Moganite: a New Mineral -- Not!" Lithosphere (1994). Aug. 2007 <http://geopress.rbnet.net/moganite.htm>.
- ^ Nickel, Ernest H., and Monte C. Nichols. "IMA/CNMNC List of Mineral Names." Materials Data. June 2007. Aug. 2007 http://www.geo.vu.nl/users/ima-cnmmn/MINERALlist.pdf Template:Wayback
- ^ Heaney, Peter J., and Jeffrey E. Post. "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties." Science ns 255 (1992): 441-443. JSTOR. Aug. 2007. Keyword: moganite.
External links
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