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12000 CTS AUSTRLIAN EMERALD UNTREATED SPECIMEN TBM-2284 trueblueminera

存货单位
TBM-2284
尺寸(毫米)
230.000 x 110.000 x 80.000mm
重量 (cts)
12000.000
Treatment
No Treatment
Clarity
N/A
类型
Specimen
Shape
Emerald
颜色

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
:城市,国家
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:总反馈

  • setillia
    setillia
    中性的

    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.

  • olga22220
    olga22220
    积极的

    Paid and shipped - no feedback left after 100 days

  • hippu65
    hippu65
    积极的

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

20%
优惠券代码 thanksgiving
有效期至
30th Nov 2024

审计

该产品已由 Gemstone Sheriff 审核,他们发现以下内容:
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Comments

The Verified Seller responsible for this item has diligently provided us with accurate and comprehensive information, encompassing crucial details such as weight, dimensions, and treatment. It is important to reiterate our commitment to upholding the highest standards of integrity and transparency in the gemstone industry. As part of our policy, we strictly permit the sale of exclusively natural gemstones that have been sourced directly from the Earth. However, in the event that a gemstone has undergone any form of treatment, it is mandatory for the seller to provide full disclosure regarding the treatment process. Furthermore, we would like to emphasize that man-made gemstones, including simulants and imitations, are strictly prohibited on our platform. We prioritize the promotion of authentic, natural gemstones to ensure a genuine and trustworthy marketplace for our valued customers. Should you have any further inquiries or require additional assistance, please do not hesitate to reach out. We are here to assist you and provide a seamless experience on Gem Rock Auctions.

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送货细节

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发货自:
Australia

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概述

列表类型 : Standard
产品编号 : 2288395
开始 : 31st October 2024 05:47 am PDT
* 所有价格均以:货币为单位