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Powellite: Gemstone Information

Powellite is CaMoO4 and is isostructural with scheelite with which it forms a series. Powellite occurs as transparent to translucent straw yellow, greenish yellow, greenish blue or blue dipyramidal crystals of the tetragonal system; the lustre is characteristically greasy or subadamantine and the hardness 3.5–4. The SG is near 4.23 and the RI of the ordinary and extraordinary rays is 1.974 and 1.984, uniaxial positive.Under both forms of UV, specimens may fluoresce yellowish white to golden yellow. Powellite occurs as an uncommon secondary mineral in the oxidation zone of molybdenum-bearing hydrothermal mineral deposits. Facetable material is rare as crystals are usually small but some specimens from the Isle Royal, Calumet and Hecla mines, Houghton County, Michigan, USA, have been fashioned. Notable crystals are found at Pandulena Hill, Nasik, Maharashtra, India.

Products

  • Coral 10.03ct 15.04x9.37x8.47mm Natural Gemstone Italy 25,075.00 20,060.00
  • Star Ruby 8.18ct 11.09x9.34x7mm Natural Gemstone 7,668.00 6,135.00
  • Emerald 0.30ct 5.91x3.91x2.00mm Natural Gemstone Zambia 8,268.00 7,500.00
  • Cats Eye Moonstone 8.63ct 16.4x12.1x6mm Natural Gemstone India 8,090.00 6,472.00
  • Hessonite Garnet 10.18ct 14.79x11.76x6.43mm Natural Gemstone Ceylon 25,450.00 20,360.00
  • White Sapphire 0.76ct 6.05x4.90x3.06mm Natural Gemstone Ceylon 11,856.00 11,400.00
  • Chrysoberyl 2.50ct 9.00x7.33x4.43mm Natural Gemstone India 13,000.00 12,500.00
  • Amethyst 9.38ct 16x12x8.2mm Natural Gemstone 2,931.00 2,345.00
  • Ruby 1.08ct 7.44x4.64x3.34mm Natural Gemstone Burma 21,465.00 19,200.00
  • Sillimanite 6.42ct 14.2x10x6.3mm Natural Rare Gemstone India 16,050.00 12,840.00

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