Sillénite
From Infogalactic: the planetary knowledge core
| Sillénite | |
|---|---|
| 240px
Sillénite from Germany
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| General | |
| Category | Oxide mineral |
| Formula (repeating unit) |
Bi12SiO20 |
| Strunz classification | 04.CB.70 |
| Dana classification | 16a.03.05.01 |
| Crystal symmetry | Cubic – tetartoidal H-M symbol (2 3) Space group: I 23 |
| Unit cell | a = 10.110 Å, Z = 2 |
| Identification | |
| Color | Olive-green, gray-green, yellow-green, yellow, reddish-brown |
| Crystal habit | Cubic crystals |
| Crystal system | Cubic |
| 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. |
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