Poudretteite

(repeating unit)KNa2B3Si12O30IMA symbolPou[1]Strunz classification9.CM.05Dana classification63.02.01a.08Crystal systemHexagonalCrystal classDihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m)Space groupP6/mccUnit cell1,221.72 ųIdentificationColorColorless, Light pinkCrystal habitRoughly equant barrel-shaped prismatic crystalsCleavageNoneFractureConchoidal, splinteryTenacityBrittleMohs scale hardness5LusterVitreous (Glassy)StreakWhiteDiaphaneityTransparentSpecific gravity2.51Density2.51Optical propertiesUniaxial (+)Refractive index1.511 to 1.532Birefringence0.021PleochroismColorless to pinkReferences[2][3][4][5][6]

Poudretteite is an extremely rare mineral and gemstone that was first discovered as minute crystals in Mont St. Hilaire, Quebec, Canada, during the 1960s.[6] The mineral was named for the Poudrette family because they operated a quarry in the Mont St. Hilaire area where poudretteite was originally found, and the quarry is currently owned by the United Kingdom based Salmon Mining Industries Inc. Poudretteite has a barely detectable radioactivity.[7]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ "Mineralienatlas – Fossilienatlas".
  3. ^ Barthelmy, Dave. "Poudretteite Mineral Data". webmineral.com.
  4. ^ "Poudretteite: Poudretteite mineral information and data". www.mindat.org.
  5. ^ "Poudretteite gemstone information". www.gemdat.org.
  6. ^ a b "Poudretteite – The Gemology Project". gemologyproject.com.
  7. ^ Multicolour – Poudretteite Archived 2013-04-12 at the Wayback Machine


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