THE PREMIER MARKETPLACE FOR REAL GEMS
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      $550.00 USD
      Geschatte adviesprijs $1,400.00

      46-CTS DUMORTIERITE ROUGH SPECIMEN RARE MINERAL RG-4220 RAREGEMS

      1363
      3

      SKU
      RG-4220
      Afmetingen (mm)
      24.400 x 22.500 x 18.000mm
      Gewicht (cts)
      46.000
      Treatment
      No Treatment
      Type
      Specimen
      Kleuren

      DUMORTIERITE

      NICE PALE  BLUE COLOUR

      FINE CRYSTAL SPECIMEN


      Dumortierite is a fibrous variably coloured aluminium boro-silicate mineral, Al7BO3(SiO4)3O3. Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals. The crystals are vitreous and vary in colour from brown, blue, and green to more rare violet and pink. Substitution of iron and other tri-valent elements for aluminium result in the colour variations. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue coloured quartzcontaining abundant dumortierite inclusions.

      Dumortierite was first described in 1881 for an occurrence in Chaponost, in the Rhône-Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873).[4] It typically occurs in high temperature aluminium rich regional metamorphic rocks, those resulting from contact metamorphism and also in boron rich pegmatites. The most extensive investigation on dumortierite was done on samples from the high grade metamorphic Gfohl unit in Austria by Fuchs et al. (2005).

      It is used in the manufacture of high grade porcelain. It is sometimes mistaken for sodalite and has been used as imitation lapis lazuli.

      Sources of Dumortierite include Austria, Brazil, Canada, France, Italy, Madagascar, Namibia, Nevada, Norway, Peru, Poland, Russia and Sri Lanka.


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      raregems
      raregems, all rough
      Mermaid Beach , Australia
      Geverifieerd
      3611 feedback

      • mschristine
        mschristine
        Positief

        I am a super happy customer with these beautiful rare turquoise gems. Accurate description, shipping was fast, just a little delivery issues here in my local city. otherwise very happy customer.

      • rich7419
        rich7419
        Positief

        Just received my Ruby it’s a cute little thing. I believe my sister-in-law will like it took a minute to get here to the states, but I am happy with my purchase would buy from you again

      • philsgems
        philsgems
        Positief

        Great piece of emerald. I have already faceted a 2.5 carat gem from it. Thankyou

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      Verzendgegevens

      Verzenden:
      $30.00 14 dagen via Standard Shipping - Tracked
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      Overzicht

      Vermeldingstype : Standard
      Product-ID : 2034110
      Begint : 31st January 2025 08:47 pm PST
      * Alle prijzen zijn in USD