Sillénite
| Sillénite | |
|---|---|
|
Sillénite from Germany | |
| General | |
| Category | Oxide mineral |
| Formula (repeating unit) | Bi12SiO20 |
| Strunz classification | 04.CB.70 |
| Dana classification | 16a.03.05.01 |
| Crystal system | Cubic |
| Unit cell | a = 10.110 Å, Z = 2 |
| Identification | |
| Color | Olive-green, gray-green, yellow-green, yellow, reddish-brown |
| Crystal habit | Cubic crystals |
| Crystal symmetry |
Cubic – tetartoidal H-M symbol (2 3) Space group: I 23 |
| 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
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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. and Nichols, Monte C., ed. (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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