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      $1,500.00 USD
      Prix ​​de vente conseillé estimé $4,500.00

      1619CTS AUSTRALIAN EMERALD UNTREATED SPECIMEN TBM-2313 trueblueminerals

      2992
      3

      UGS
      Dimensions (mm)
      108.000 x 96.000 x 28.000mm
      Poids (cts)
      1619.000
      Shape
      Emerald
      Treatment
      No Treatment
      Taper
      Specimen
      Couleurs

      AUSTRALIAN EMERALD

      Curlew Emerald Mine, Shaw River District, East Pilbara Shire, Western Australia, Australia

      STUNNING SPECIMEN

      TREATMENT -NONE

      COLLECTOR PC

       GREEN-CRYSTAL

      HAS PURPLE FLOURITE INCLUSION

      ON HOST ROCK

      Specimens can consist Light green beryl crystals to green beryl coloration, with minor dark biotite specks mica ,schist and purple fluorite inclusions.

      The dark mica schists within the quartz veins and pegmatites contain gem quality emerald crystals and green beryl. As is typical of Western Australian emerald


      Beryl Be3Al2(Si6O18) , Biotite K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 , Quartz SiO2



      Curlew Emerald Mine, Shaw River District, East Pilbara Shire, Western Australia, Australia


      Nearly all production of emerald in Western Australia has been from a deposit at Poona but there are beryl and emerald deposits at Menzies and in the Pilbara region, south of Port Hedland.

      Australian emeralds

      Emeralds have been commercially mined in Australia in three main deposits Poona and Menzies in Western Australia, and Emmaville in New South Wales. The emeralds are usually in rocks among layers of other minerals such as mica. Open pit mining or terrace mining are the most common methods.
      discovered in Western Australia in 1912 at Poona, 500 km north-east of Perth. The main mine of the district was the Aga Khan which operated on and off for more than 70 years until 1980 and yielded an estimated 10,000 grams of mostly low value emerald. During the1980s another mine in WA was worked some 40kms west of Menzies.
      In Australia, emerald is associated with granite pegmatites and metamorphosed rocks called schists. It is also sometimes associated with altered limestones or can be found embedded in calcite or quartz. A pegmatite forms when a magma cools, leaving some elements behind in the remaining fluid. Emerald crystals may grow when the remaining solution cools as long as the necessary elements are present, including beryllium. Emeralds can also form in veins in the crust from hot liquids that escape from a deeper magma.

      Processing

      Screens are used to sort the emeralds by size and then silt and clays are washed away to expose the emerald-bearing schist. No other chemicals are used in this process. Any schist or other rock still attached to the emerald is removed manually in a process called cobbing. Higher quality materials can be cleaned using high-pressure air.

      Mining

      Emeralds have been commercially mined in Australia in three main deposits Poona and Menzies in Western Australia, and Emmaville in New South Wales. The emeralds are usually in rocks among layers of other minerals such as mica. Open pit mining or terrace mining are the most common methods. Miners dig a pit with shovels, excavators or other earth moving equipment, depending on the scale of the mine. If the emerald-bearing ore is beneath a substantial cover of soil and rock, explosives might be used to remove this material. Sometimes high pressure water is used to blast the rock to reveal mineral bearing rocks. Tunnels are also used to extract emeralds from deeper rock layers.


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      trueblueminerals
      trueblueminerals
      rare large gemstones and minerals
      Mermaid Beach , Australia
      Vérifié
      814

      • peketrain
        peketrain
        Positif

        Very pleased with the specimen and transaction

      • scsamler
        scsamler
        Positif

        This stone made me fall in love with Padparadsha sapphire. Truly wonderful!

      • gmiller69
        gmiller69
        Positif

        Paid and shipped - no feedback left after 100 days

      20%
      Code promo love
      Valable jusque
      28th Feb 2025

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      Les détails d'expédition

      Expédition:
      $30.00 14 les jours via Standard Shipping - Tracked
      Expédié depuis:
      Australia

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      Aperçu

      Type d'inscription : Standard
      Identifiant du produit : 1503939
      Départs : 12th February 2025 06:36 pm PST
      * Tous les prix sont en USD