Teineite

Teineite
General
Category Mineral
Formula
(repeating unit)		 Cu(TeO3) · 2 H2O
Strunz classification 4.JM.20
Dana classification 34.2.2.2
Crystal system Orthorhombic
Crystal class Disphenoidal (222)
H-M symbol: (2 2 2)
Space group P212121
Unit cell a = 6.63, b = 9.61
c = 7.43 [Å]; Z = 4
Identification
Color Sky-blue, cobalt-blue, bluish gray, bright blue to greenish blue in transmitted light.
Crystal habit Prismatic or flattened crystals, Sometimes as crusts or aggregates
Cleavage Distinct
Fracture Brittle
Tenacity Brittle
Mohs scale hardness 2.5
Luster Vitreous, dull
Streak Light blue
Diaphaneity Semitransparent
Specific gravity 3.8
Optical properties Biaxial (-)
Birefringence δ = 0.024
Pleochroism Various shades of blue
2V angle 36o
Fusibility Fusible, gives a black bead
Solubility Insoluble
Common impurities Sulfur
References

Teineite is a tellurate mineral with the formula Cu(TeO3) . 2 H2O. It has a Moh's hardness of 2.5 and it comes in many different shades of blue, ranging from cerulean blue to bluish-gray. The mineral millsite has the same chemical composition, but crystallizes in the monoclinic system, while teineite crystallizes in the orthorhombic system.[1][2][3]

Occurrence

Teineite was first identified in the Teine mine, Sapporo, Hokkaido, Japan, where the name of this mineral originates. It occurs in veins where copper- and tellurium-bearing sulfides were oxidized and is often associated with tellurite, tellurium, pyrite, tetrahedrite, sphalerite, azurite, malachite, quartz, baryte, hessite, galena, bornite, cerussite, chlorargyrite, quetzalcoatlite, cuprite and graemite.[4][5] It has also been found in other places, including other mines in Japan, several mines in the USA and mines in Mexico, Belgium, Russia and Norway.[1][4]

See also

References

  1. 1 2 "Teineite: Teineite mineral information and data". www.mindat.org. Retrieved 2016-09-19.
  2. ↑ "Millsite: Millsite mineral information and data". www.mindat.org. Retrieved 2016-09-19.
  3. ↑ Barthelmy, Dave. "Teineite Mineral Data". www.webmineral.com. Retrieved 2016-09-19.
  4. 1 2 "Handbook of mineralogy" (PDF). Retrieved 2016-09-19.
  5. ↑ Yosimura, Toyohumi (1936). "Teineite, a New Tellurate Mineral from the Teine Mine, Hokkaidō, Japan" (PDF). Journal of the Faculty of Science, Hokkaido Imperial University. 4. Retrieved 2016-09-19.
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