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      03b31ce3-ea2f-4a34-ae23-a5167919d7e9.jpg
      6ed514f4-7d15-438c-a2bf-d998d9f67629.jpg
      $55.00 USD
      Estimated RRP $200.00

      4.75-CTS DUMORTIERITE ROUGH SPECIMEN RARE MINERAL RG-4215 RAREGEMS

      1094
      5

      SKU
      RG-4215
      Dimensions (mm)
      14.800 x 6.500 x 6.200mm
      Weight (cts)
      4.750
      Treatment
      No Treatment
      Type
      Specimen
      Colours

      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

      Shipping provider Shipping to Australia Shipping to rest of world
      Standard Shipping - Tracked $19.00 / 7 days $30.00 / 14 days
      Australia
      Standard Shipping - Tracked is discounted to $19.00 on orders with 2 or more items
      Rest of the world
      Standard Shipping - Tracked is discounted to $30.00 on orders with 2 or more items
      FedEx $39.00 / 4 days $40.00 / 4 days
      Australia
      FedEx is discounted to $39.00 on orders with 2 or more items
      Rest of the world
      FedEx is discounted to $40.00 on orders with 2 or more items
      DHL $19.00 / 2 days $30.00 / 14 days
      Rest of the world
      DHL is discounted to $30.00 on orders with 2 or more items

      raregems
      raregems
      raregems, all rough
      Mermaid Beach, Australia
      Verified
      3624 Feedback

      • solusinexistentia
        solusinexistentia
        Positive

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

      • solusinexistentia
        solusinexistentia
        Positive

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

      30%
      Coupon code 30
      Valid Until
      1st Mar 2025

      Audit

      The Gemstone Sheriff program allows our members to request an audit on any product, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.

      Shipping Details

      Shipping:
      $30.00 14 days via Standard Shipping - Tracked
      Ships from:
      Australia

      Payment Options

      • stripe
      This seller adds 0.00% tax to transactions in Australia.

      Overview

      Listing Type : Standard
      Product ID : 2034122
      Starts : 14th February 2025 08:53 pm PST
      * All prices are in USD