Sillénite
Sillénite | |
---|---|
Sillénite from Germany | |
General | |
Category | Oxide mineral |
Formula (repeating unit) | Bi12SiO20 |
Strunz classification | 4.CB.70 |
Dana classification | 16a.03.05.01 |
Crystal system | Cubic |
Crystal class |
Tetartoidal (23) H-M symbol: (23) |
Space group | I23 |
Unit cell | a = 10.110 Å, Z = 2 |
Identification | |
Color | Olive-green, gray-green, yellow-green, yellow, reddish-brown |
Crystal habit | Cubic crystals |
Mohs scale hardness | 1–2 |
Luster | Adamantine |
Diaphaneity | Translucent |
Specific gravity | 9.16 |
Optical properties | Isotropic |
Refractive index | >2.5 |
Birefringence | none |
Solubility | Soluble in hydrochloric acid |
References | [1][2][3] |
Sillénite or sillenite is a mineral with the chemical formula Bi12SiO20. It is named after the Swedish chemist Lars Gunnar Sillén, who mostly studied bismuth-oxygen compounds. It is found in Australia, Europe, China, Japan, Mexico and Mozambique, typically in association with bismutite.[1][2][3]
The cubic crystal structure of sillénite is shared by several synthetic materials including bismuth silicon oxide, bismuth titanate and bismuth germanate.[4]
References
Wikimedia Commons has media related to Sillénite. |
- 1 2 Sillenite. Webmineral
- 1 2 Sillenite. Mindat
- 1 2 Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1995). "Sillenite". Handbook of Mineralogy (PDF). II (Silica, Silicates). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209716.
- ↑ Santos, D. J.; Barbosa, L. B.; Silva, R. S.; MacEdo, Z. S. (2013). "Fabrication and Electrical Characterization of Translucent Bi12TiiO20 Ceramics". Advances in Condensed Matter Physics. 2013: 1. doi:10.1155/2013/536754.
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