Colemanite
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| Colemanite | |
|---|---|
| 240px | |
| General | |
| Category | Inoborates |
| Formula (repeating unit) |
CaB3O4(OH)3·H2O |
| Strunz classification | 06.CB.10 |
| Crystal symmetry | Monoclinic 2/m |
| Unit cell | a = 8.712(2) Å, b = 11.247(3) Å, c = 6.091(1) Å; β = 110.12°; Z = 4 |
| Identification | |
| Color | Colorless, white, yellowish, grey |
| Crystal habit | Massive granular to coarsely crystalline, most commonly nodular. |
| Crystal system | Monoclinic - Prismatic |
| Cleavage | [010] perfect, [001] distinct |
| Fracture | Brittle uneven to subconchoidal |
| Mohs scale hardness | 4.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.42 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.586 nβ = 1.592 nγ = 1.614 |
| Birefringence | δ = 0.028 |
| Fusibility | 1.5 |
| Diagnostic features | Exfoliates on heating, produces a green flame |
| Other characteristics | Bright pale yellow fluorescence, may phosphoresce pale green; pyroelectric and piezoelectric at very low temperature. |
| References | [1][2][3][4] |
Colemanite (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite.[1]
It was first described in 1884 for an occurrence near Furnace Creek in Death Valley and was named after William Tell Coleman (1824–1893), owner of the mine Harmony Borax Works where it was first found.[2] At the time, Coleman had alternatively proposed the name "smithite" instead after his business associate Francis Marion Smith.[5]
Contents
Uses
Colemanite is an important ore of boron, and was the most important boron ore until the discovery of kernite in 1926. It has many industrial uses, like the manufacturing of heat resistant glass.[6]
See also
References
- ↑ 1.0 1.1 Klein, Cornelis and Cornelius S. Hurlbut, Jr.; 1985, Manual of Mineralogy, Wiley, 20th ed., p. 347 ISBN 0-471-80580-7
- ↑ 2.0 2.1 http://www.mindat.org/min-1108.html Mindat
- ↑ http://webmineral.com/data/Colemanite.shtml Webmineral
- ↑ http://rruff.geo.arizona.edu/doclib/hom/colemanite.pdf Handbook of Mineralogy
- ↑ Hildebrand, GH. (1982) Borax Pioneer: Francis Marion Smith. San Diego: Howell-North Books. p 31 ISBN 0-8310-7148-6
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External links
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