Poudretteite

Poudretteite
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 - Fossilienatlas".
  2. ↑ Barthelmy, Dave. "Poudretteite Mineral Data". webmineral.com.
  3. ↑ "Poudretteite: Poudretteite mineral information and data". www.mindat.org.
  4. ↑ "Poudretteite gemstone information". www.gemdat.org.
  5. 1 2 "Poudretteite - The Gemology Project". gemologyproject.com.
  6. ↑ Multicolour - Poudretteite Archived 2013-04-12 at the Wayback Machine.
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