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Dickinsonite: Gemstones Information

Dickinsonite is KNa4Ca(Mn2,Fe2)14Al(PO4)12(OH)2 and forms very small monoclinic commonly rhombohedral olive green tabular transparent to translucent crystals with a perfect cleavage in one direction with striations giving a triangular pattern. The hardness is 3.5–4 and the SG 3.34–3.41. The RI for the alpha, beta and gamma rays is 1.648–1.658,1.655–1.662, 1.662–1.671, biaxial positive with birefringence 0.013.Dickinsonite, of which some faceted stones turn up occasionally, occurs as a high-temperature mineral in granite pegmatites. Crystals are from Branchville, Connecticut, USA.

 

Products

  • Charoite 7.27ct 14.06x10.11x5.79mm Natural Gemstone Russia 908.00 727.00
  • Blue Topaz 3.25ct 9x7x5mm Natural Gemstone Brazil 2,031.00 1,625.00
  • Apatite 3.17ct 10.20x7.58x5.72mm Natural Gemstone India 7,925.00 6,340.00
  • Graphic Jasper Gemstone Graphic Jasper 16.51ct 27.11x17.26x5.06mm Natural Gemstone Indonesia 2,063.00 1,651.00
  • Padparadscha Sapphire 0.56ct 5.45x4.62x2.19mm Natural Gemstone Ceylon 17,500.00 14,000.00
  • 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
  • Graphic Jasper 17.88ct 27.82x16.44x5.30mm Natural Gemstone Indonesia 2,235.00 1,788.00
  • Star Ruby 8.18ct 11.09x9.34x7mm Natural Gemstone 7,668.00 6,135.00
  • Tanzanite 8.01ct 13.3x10.2x7.1mm Natural Gemstone Tanzania 10,012.00 8,010.00

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