Chrysocolla
Chrysocolla | ||
---|---|---|
Specific gravity 1.9–2.4 | | |
Optical properties | Biaxial (−) | |
Refractive index | nα = 1.575–1.585 nβ = 1.597 nγ = 1.598–1.635 | |
Birefringence | δ = 0.023–0.050 | |
References | [3][4][1][5] |
Chrysocolla (
2 – xAl
x(H
2Si
2O
5)(OH)
4⋅nH
2O (x < 1)[1] or (Cu, Al)
2H
2Si
2O
5(OH)
4⋅nH
2O).[4]
The structure of the mineral has been questioned, as a 2006 spectrographic study suggest material identified as chrysocolla may be a mixture of the copper hydroxide spertiniite and chalcedony.[6]
History
The name chrysocolla comes from the Ancient Greek χρυσός (khrusós) and κολλα (kolla), meaning "gold" and "glue" respectively,[7] in allusion to the name of the material used to solder gold. The word was first used by Theophrastus in 315 BC.
Geology
Chrysocolla has a
A 2006 study has produced evidence that chrysocolla may be a microscopic mixture of the copper hydroxide mineral spertiniite, amorphous silica and water.[6][1]
Jewelry
Due to being somewhat more common than
Gallery
-
Powder-blue chrysocolla as stalactitic growths and as a thin carpet in vugs inside a boulder of nearly solid tyrolite, from the San Simon Mine, Iquique Province, Chile (size: 14.1 cm × 8.0 cm × 7.8 cm (5.6 in × 3.1 in × 3.1 in))
-
Banded white to blue green chrysocolla, from Bisbee, Arizona (size: 12.2 cm × 5.5 cm × 5.2 cm (4.8 in × 2.2 in × 2.0 in))
-
Chrysocolla and silverBingham Canyon, West Valley City, Utah.
-
Brochantite (emerald green) and chrysocolla, from the Rokana Mine, Zambian Copperbelt
See also
References
- ^ a b c d Chrysocolla, Mindat.org
- S2CID 235729616.
- ^ "Chrysocolla". Mineralienatlas – Fossilienatlas.
- ^ a b "Chrysocolla" (PDF). Handbook of Mineralogy.
- ^ Chrysocolla Mineral Data, WebMineral.com
- ^ a b François Farges, Karim Benzerara, Gordon E. Brown, Jr.; Chrysocolla Redefined as Spertiniite; SLAC-PUB-12232; 13th International Conference On X-Ray Absorption Fine Structure (XAFS13); July 9-14, 2006; Stanford, California
- ^ Spencer, Leonard James (1911). Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 6 (11th ed.). Cambridge University Press. p. 320. . In
- ^ "Gem Silica: The blue, most valuable variety of chalcedony". geology.com.
- ^ "Chrysocolla: The gemstone chrysocolla information and pictures". www.minerals.net.
- ^ "Chrysocolla Value, Price, and Jewelry Information - IGS".