THE PREMIER MARKETPLACE FOR REAL GEMS
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      $550.00 USD
      預計建議零售價:rrp

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

      1364
      3

      存貨單位
      RG-4220
      尺寸(毫米)
      24.400 x 22.500 x 18.000mm
      重量 (cts)
      46.000
      Treatment
      No Treatment
      類型
      Specimen
      顏色

      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
      raregems, all rough
      :城市,國家
      已驗證
      :總反饋

      • mschristine
        mschristine
        積極的

        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
        積極的

        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
        積極的

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

      審計

      Gemstone Sheriff計畫允許我們的會員要求對任何產品進行審核,該審核由獨立的Gemologist人員完成,該資格人員評估商品描述和圖片的準確性。

      送貨細節

      船運:
      $30.00 14透過Standard Shipping - Tracked計算天數
      發貨自:
      Australia

      付款方式

      • stripe
      該賣家在Australia交易中加入了0.00%稅。

      概述

      列表類型 : Standard
      產品編號 : 2034110
      開始 : 31st January 2025 08:47 pm PST
      * 所有價格均以:貨幣為單位