Poudretteite

Poudretteite

Faceted poudretteite, 0.51 ct, Mogok, Myanmar
General
Category Cyclosilicate
Formula
(repeating unit)		 KNa2B3Si12O30
Strunz classification 9.CM.05
Dana classification 63.02.01a.08
Crystal system Hexagonal
Crystal class Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m)
Space group P6/mcc
Identification
Color Colorless, Light pink
Crystal habit Roughly equant barrel-shaped prismatic crystals
Cleavage None
Fracture Conchoidal, splintery
Tenacity Brittle
Mohs scale hardness 5
Luster Vitreous (Glassy)
Streak White
Diaphaneity Transparent
Specific gravity 2.51
Optical properties Uniaxial +
Refractive index 1.511 to 1.532
Birefringence 0.021
Pleochroism Colorless to pink
References [1][2][3][4][5]

Poudretteite is an extremely rare mineral and gemstone that was first discovered as minute crystals in Mont St. Hilaire, Quebec, Canada, during the 1960s.[5] The mineral was named for the Poudrette family because they operated a quarry in the Mont St. Hilaire area where poudretteite was originally found.[6]

References

  1. ↑ Mineralienatlas
  2. ↑ http://webmineral.com/data/Poudretteite.shtml
  3. ↑ http://www.mindat.org/min-3272.html
  4. ↑ http://www.gemdat.org/gem-3272.html
  5. 1 2 http://gemologyproject.com/wiki/index.php?title=Poudretteite
  6. ↑ Multicolour - Poudretteite
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