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321.65 CTS AUSTRLIAN EMERALD QUALITY SPECIMEN TBM- 2305 trueblueminerals

SKU
寸法(mm)
48.000 x 36.000 x 28.000mm
重さ (CT)
321.650
Shape
Emerald
Treatment
No Treatment
タイプ
Specimen

AUSTRALIAN EMERALD

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

STUNNING SPECIMEN

TREATMENT -NONE

COLLECTOR PC

 GREEN-CRYSTAL

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
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  • setillia
    setillia
    中性

    Responsive seller, which is appreciated. Lovely gem. The only issue was with shipping. I paid for post but it was sent via Fedex. Fedex (of course) charged me illegal fees over a month after delivery! This was why I chose post and not Fedex.

  • hippu65
    hippu65
    ポジティブ

    Been watching this for some time.. Got me a deal..! Great !

  • peketrain
    peketrain
    ポジティブ

    Fast shipment. Very well packed. Would buy again from this seller

20.00%
クーポンコード thanksgiving
まで有効
30th Nov 2024

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発送詳細

配送:
$30.00 Standard Shipping - Tracked 経由の日数をカウント
発送元:
Australia

支払いオプション

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概要

リストタイプ : Standard
製品番号 : 1498488
始まります : 23rd October 2024 08:09 pm PDT
* すべての価格は:通貨で表示されます