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

Wikimedia Commons has media related to Sillénite.
  1. 1 2 Sillenite. Webmineral
  2. 1 2 Sillenite. Mindat
  3. 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.
  4. 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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