$4,000.00 USD
Prix ​​de vente conseillé estimé $12,000.00
Fermé
20/08/2023 04:33 pm

3265CTS AUSTRALIAN EMERALD QUALITY SPECIMEN TBM-2335 trueblueminerals

UGS
Dimensions (mm)
122.000 x 91.000 x 47.000mm
Poids (cts)
3265.000
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
808

  • peketrain
    peketrain
    Positif

    Very pleased with the specimen and transaction

  • setillia
    setillia
    Neutre

    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.

  • bainesrh
    bainesrh
    Positif

    Beautiful gemstone

  • gordan108
    gordan108
    Positif

    Paid and shipped - no feedback left after 100 days

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3rd Dec 2024

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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 : 1539657
Départs : 6th August 2023 05:17 pm PDT
* Tous les prix sont en USD