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Tourmaline Var Chromium-dravite

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CYM622780

Tourmaline Var Chromium-dravite

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Description
Locality: 
Commander Mine, Nadonjukin, Simanjiro District, Manyara Region, Tanzania (United Republic)
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.8 × 1.2 × 1 cm
Largest Crystal: 
2.80cm
Description

Absolutly top. terminated single gem crystal of chrome tourmaline which is a chromium and vanadium rich dravite. 
Complete all around with deep emerald green coloration in the upper half and a more olive green in the lower half. Visable red color on down. This tourmaline is a pleochroic gem. From one side is green and some red, but from other if you use light we cann see more red.
Fantastic color and highly gemmy. Undamaged. 
From a spectacular pocket opened in 2016. Weighs 6,16 grams

 

Mineral Data
What's on the rock

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7

Chromium-dravite

Formula: 
Na(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
Group Parent: 
Tourmaline
Strunz: 
8/E.19-30
Crystal System: 
Trigonal
Hardness: 
7 - 7½
Colour: 
Dark emerald-green to greenish-black.
Streak: 
Greyish-green
Piatek Minerals

Current price

Starting price

489
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Start 18 Nov 18:00
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Shipping Information

Postage Area Price
Europe
$25
North America
$30
Asia
$30
Australia
$30

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Seller's terms and conditions

YOUR 100% SATISFACTION GUARANTEE. If you are not happy with your purchase or the specimen is broken during the shipping we will accept return. Up to 14 days after you received the item please e-mail us to arrange the refund. Upon auction close, you will be sent an invoice indicating final value of the specimen. Payments must be made within 7 days of auction close. If you would like to purchase multiple items past our 7 day payment period or would like your package held for any reason please hold off on payment until you are ready to have your package shipped to you. We ask that you email to inform us that you are still bidding or your payment is going to be delayed. Communication is paramount! Payment can be made through Paypal or Bank transfer