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Richterite: Gemstone Information

Richterite is Na(NaCa)Mg5Si8O22(OH)2 and a member of the amphibole group. It forms flattened prismatic monoclinic crystals with one direction of perfect cleavage, hardness 5–6 and SG 2.97–3.45. Opaque blue material has been fashioned. The RI for the alpha, beta and gamma rays is 1.605–1.624, 1.618–1.64 and 1.627–1.641, biaxial negative. Richterite occurs in contact-metamorphosed limestones and in alkalic igneous rocks and carbonatites. The blue material has been found at the Kalahari manganese orefield, South Africa.

Products

  • Graphic Jasper Gemstone Graphic Jasper 16.51ct 27.11x17.26x5.06mm Natural Gemstone Indonesia 2,063.00 1,651.00
  • Kunzite 18.02ct 14.00x14.00x10.20mm Natural Gemstone Afghanistan 22,525.00 18,020.00
  • Opal 2.66ct 10.8x9.2x5.8mm Natural Gemstone Ethiopia 6,650.00 5,320.00
  • Hessonite Garnet 10.18ct 14.79x11.76x6.43mm Natural Gemstone Ceylon 25,450.00 20,360.00
  • Graphic Jasper 17.88ct 27.82x16.44x5.30mm Natural Gemstone Indonesia 2,235.00 1,788.00
  • Chrysoberyl Cats Eye 1.34ct 5.73x5.62x4.29mm Natural Gemstone India 17,440.80 16,758.00
  • Ruby 1.08ct 7.44x4.64x3.34mm Natural Gemstone Burma 21,465.00 19,200.00
  • Graphic Jasper Gemstone Graphic Jasper 28.56ct 28.23x19.31x7.28mm Natural Gemstone Indonesia 3,570.00 2,856.00
  • Chrysoberyl 2.50ct 9.00x7.33x4.43mm Natural Gemstone India 13,000.00 12,500.00
  • Charoite 7.27ct 14.06x10.11x5.79mm Natural Gemstone Russia 908.00 727.00

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