كولمانيت Colemanite
| Colemanite | |
|---|---|
 | |
| العامة | |
| التصنيف | Inoborates |
| الصيغة (repeating unit) | Ca2B6O11·5H2O |
| تصنيف سترونز | 6.CB.10 |
| النظام البلوري | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/a |
| Unit cell | a = 8.712(2) Å, b = 11.247(3) Å, c = 6.091(1) Å; β = 110.12°; Z = 4 |
| التعرف | |
| Color | Colorless, white, yellowish, grey |
| Crystal habit | Massive granular to coarsely crystalline, most commonly nodular. |
| Cleavage | [010] perfect, [001] distinct |
| Fracture | Brittle uneven to subconchoidal |
| Mohs scale hardness | 4.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| الجاذبية النوعية | 2.42 |
| الصفات البصرية | Biaxial (+) |
| Refractive index | nα = 1.586 nβ = 1.592 nγ = 1.614 |
| Birefringence | δ = 0.028 |
| قابلية الانصهار | 1.5 |
| السمات التشخيصية | Exfoliates on heating, produces a green flame |
| سمات أخرى | Bright pale yellow fluorescence, may phosphoresce pale green; pyroelectric and piezoelectric at very low temperature. |
| References | [1][2][3][4][5] |
Colemanite (Ca2B6O11·5H2O)[5] or (CaB3O4(OH)3·H2O)[3] 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.[2]
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.[3] At the time, Coleman had alternatively proposed the name "smithite" instead after his business associate Francis Marion Smith.[7]
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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.[8]
Occurrence
About 40% of the world's known colemanite reserves are at the Emet mine in western Turkey.[9] Other important sources in Turkey are found at Bigadiç and Kestelek.[10]
See also
References
- ^ Schorn, Stefan; et al. (2021). "Colemanit (Colemanite)". Mineralienatlas.
- ^ أ ب Klein, Cornelis; Hurlbut, Cornelius S. Jr. (1993). Manual of mineralogy: (after James D. Dana) (21st ed.). New York: Wiley. p. 422. ISBN 0-471-57452-X.
- ^ أ ب ت قالب:Mindat
- ^ "Colemanite mineral data". Webmineral. Retrieved 30 December 2021.
- ^ أ ب Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Colemanite" (PDF). Handbook of Mineralogy.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Hildebrand, GH. (1982) Borax Pioneer: Francis Marion Smith. San Diego: Howell-North Books. p 31 ISBN 0-8310-7148-6
- ^ "Nitrates". Simon & Schuster's Guide to Rocks and Minerals. Simon & Schuster. 1977. p. entry 111. ISBN 978-0-671-24417-0.
- ^ "Emet". Eti Maden. Retrieved 29 November 2024.
- ^ "Country Profile – Boron Turkey". Borates Today. Retrieved 29 November 2024.
External links
- قالب:Cci
Spencer, Leonard James (1911). . In Chisholm, Hugh (ed.). دائرة المعارف البريطانية. Vol. 6 (eleventh ed.). Cambridge University Press. p. 665. {{cite encyclopedia}}: Cite has empty unknown parameter:|coauthors=(help)- "Death Valley - Historic Resource Study - A History of Mining".
