Cesbronite

Cesbronite
General
Category Copper-tellurium oxysalt
Formula
(repeating unit)		 Cu3Te6+O4(OH)4
Strunz classification 4.JN.15
Dana classification 34.7.2.1
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pbcn
Unit cell a = 8.624, b = 11.878
c = 5.872 [Å], Z = 2
Identification
Color Green
Cleavage poor on {010}, good on {021}
Tenacity Brittle
Mohs scale hardness 3
Luster Subadamantine
Streak Green
Diaphaneity Translucent
Specific gravity 4.45 (measured)
Optical properties Biaxial (+)
Birefringence δ = 0.149
Pleochroism Distinct, various shades of green
2V angle 72o (calculated)
Ultraviolet fluorescence None
Solubility Soluble in HCl and HNO3. Insoluble in water
References [1]

Cesbronite is a copper-tellurium oxysalt mineral with the chemical formula Cu3Te6+O4(OH)4 (IMA 17-C). It is colored green and its crystals are orthorhombic dipyramidal. Cesbronite is rated 3 on the Mohs Scale.[2] It is named after Fabien Cesbron (born 1938), a French mineralogist.[3]

Occurrence

It was first found in the Bambollita ("La Oriental") mine in the Mexican state of Sonora. It also occurs in the Tombstone District of Cochise County, Arizona and the Tintic District of the East Tintic Mountains, Juab County, Utah.[4] It is often associated with argentian gold, teineite, carlfriesite, xocomecatlite, utahite, leisingite, jensenite and hematite.[5]

See also

References

  1. ↑ Mineralienatlas
  2. ↑ Webmineral entry
  3. ↑ Williams, Sidney A. (1974). "Cesbronite, a new copper tellurite from Moctezuma, Sonora" (PDF). Mineralogical magazine. 39. Retrieved 2016-09-20.
  4. ↑ Mindat.org Cesbronite
  5. ↑ "Handbook of mineralogy" (PDF). Retrieved 2016-09-20.
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