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      $70.00 USD
      Geschatte adviesprijs $210.00

      7CTS DUMORTIERITE ROUGH SPECIMEN RARE MINERAL RG-4216 RAREGEMS

      1120
      8

      SKU
      RG-4216
      Afmetingen (mm)
      19.600 x 7.700 x 7.400mm
      Gewicht (cts)
      7.000
      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 color from brown, blue, and green to more rare violet and pink. Substitution of iron and other tri-valent elements for aluminium result in the color 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 colored 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.

      TRADING AS TRUEBLUEOPALS / LIGHTNINGOPALS LLC

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      raregems
      raregems, all rough
      Mermaid Beach , Australia
      Geverifieerd
      3624 feedback

      • solusinexistentia
        solusinexistentia
        Positief

        Great quality and price! Item arrived on time. Will purchase from seller again.

      • solusinexistentia
        solusinexistentia
        Positief

        Good experience with seller. Items arrived on time and as described for a good price.

      30%
      Coupon code 30
      Geldig tot
      1st Mar 2025

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      Verzendgegevens

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      $30.00 14 dagen via Standard Shipping - Tracked
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      Overzicht

      Vermeldingstype : Standard
      Product-ID : 2034120
      Begint : 14th February 2025 08:53 pm PST
      * Alle prijzen zijn in USD