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Very Very Rare Vorobyevite (Rosterite) Combine With Bi Color Tourmaline Fro

7083
6

SKU
Dimensions (mm)
37.500 x 23.000 x 13.500mm
Weight (cts)
76.000
Treatment
No Treatment
Type
Rough
Colours

Collectors Minerals Very Very Rare Vorobyevite (Rosterite) Combine With Bi Color Tourmaline From Afghanistan Beryl (Var: Alkali-beryl) : Be3Al2(Si6O18),

Origin : Afghanistan,      Color : Seen In Pictures

Shipment will be ships within 3 business days after receiving payment.

Vorobyevite (sometimes called Rosterite) is a rare variety of Beryl that does not qualify as its own species. The name was applied to both colourless cesium-bearing beryls from the Urals and rose-coloured and colourless alkali-rich beryls from Madagascar, all of which showed sharp hexagonal crystals which are shortened on the c-axis. This new find had a similar morphology, which led to puzzlement over what it was. Although the morphology of these crystals is clearly unusual (see photos), and although the crystal habit of these strange beryls is similar to Pezzotaite (which is a valid species of beryl), these do not contain enough cesium OR OTHER ALKALI to be classified a new species under current mineralogical rules. To be sure of the classification of this unusual material, when the pocket was found, we sent the whole lot to the lab of Dr. Federico Pezzotta in Milan. He performed analyses on multiple specimens to show that one can consider these to be ALKALI-rich, EVEN IF NOT PARTICULARLY CESIUM RICH COMPARED TO OTHER EXAMPLES, and he believes this is the reason for the crystal habit we see here (bowed-in centers; sandwich-like look on the edge faces with color zoning; and unusual sharply tabular morphology). I was able to buy nearly the entire pocket of this material, which I was told was mined in mid-2012 in the summer season. The altitude is a problem - it is difficult to access and the mining season here is only 3 months. No more were found in 2014 to date, despite an attempt. While we were initially told the specimens were from Gilgit, we now have better confirmation that the locality is Deo Darrah, Khash & Kuran Wa Munjan District, Badakhshan Prov., Afghanistan.

May 13, 2015 - NOTES: After further consultation with Dr. Pezzotta, he confirms that because of the unusual crystal shape (perhaps constrained by heavy alkali element presence) and the high alkali element representation here, that he believes these are indeed sufficiently non-mainstream beryl to classify as the varietal “Vorobyevite.” However, they contain very little if any cesium, as initially reported.

Shipment will be ships within 3 business days after receiving payment.

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Combine shipping up to 20 cut gemstone.

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Rest of the world
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goldengemrumigemsltd
REGISTERED GEMSTONE COMPANY UNITED KINGDOM AND PAKISTAN. Deals in Precious And Semi Precious Rough and Un Polish Minerals Specimen , Cut Gemstones & Silver Hand Made Jewelry Our Store give you Reasonable Gemstone, PayPal Available By sending invoice manually. Thank For Gemrockauction Website And Buyers to appreciate my work.
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25%
Coupon code SALE25
Valid Until
1st Jan 2025

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Shipping Details

Shipping:
$18.00 21 days via Registered Shipping
Ships from:
United Kingdom

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Overview

Listing Type : Standard
Product ID : 771264
Starts : 10th December 2024 07:51 am PST
* All prices are in USD