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Collectors Minerals Very Very Rare Vorobyevite (Rosterite) Cluster From Afg
- 存貨單位
- 尺寸（毫米）
- 23.000 x 14.500 x 9.500mm
- 重量 (cts)
- 12.800
- Treatment
- No Treatment
- 類型
- Specimen
- 顏色
-
Collectors Minerals Very Very Rare Vorobyevite (Rosterite) Cluster 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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For Shipping Please provide us with complete and accurate / valid mailing address and contact number (Land line / Mobile). Please avoid P.O BOX Address.
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We well try our best to meet your needs
If For Any Reason You Are not 100% Fully Satisfied With Purchase You May Return Your Item With In 15 Days After You Have Received if For Refund Shipping Cost are Non Refundable
Questions Are Welcomed.
Color may not appear exactly as in real life due to variation between computers monitor resolution and lights.
The buyer is full responsible for any import customs duties and Taxes in his country.
We do not have any control over these. Duties, taxes & etc.
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Give us 5 stars *****.
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- 存貨單位
- 尺寸（毫米）
- 23.000 x 14.500 x 9.500 mm
- 重量 (cts)
- 12.800
- Treatment
- No Treatment
- 類型
- Specimen
- 顏色
-
Collectors Minerals Very Very Rare Vorobyevite (Rosterite) Cluster 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.
Shipping Policy
For Shipping Please provide us with complete and accurate / valid mailing address and contact number (Land line / Mobile). Please avoid P.O BOX Address.
Return Policy.
Please do no leave negative or neutral feedback. If there anything that needs to be fixed please let us know.
We well try our best to meet your needs
If For Any Reason You Are not 100% Fully Satisfied With Purchase You May Return Your Item With In 15 Days After You Have Received if For Refund Shipping Cost are Non Refundable
Questions Are Welcomed.
Color may not appear exactly as in real life due to variation between computers monitor resolution and lights.
The buyer is full responsible for any import customs duties and Taxes in his country.
We do not have any control over these. Duties, taxes & etc.
Feedback
Give us 5 stars *****.
If For any Reason you are Unhappy Or Not Satisfied With Item You Received Please Contact US prior to leaving Negative FEEDBACK. We Always Resolve Any Issues Our Customer May Have.
Our Aim is to make a strong Relationship With Our Customer And Develop A Healthy Business.
| 運輸商 | 運送至：國家 | 運送到世界其他地區 |
|---|---|---|
| DHL | $35.00 / ：幾天天 | $35.00 / ：幾天天 |
|
：國家
DHL訂單折扣為$35.00 6或更多商品
世界其他地區
DHL訂單折扣為$35.00 6或更多商品
|
||
| Registered Shipping | $12.00 / ：幾天天 | $15.00 / ：幾天天 |
|
世界其他地區
Registered Shipping對於400.00或以上的訂單折扣為$15.00
|
||
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積極的the wonderful cut makes such a plain rock grogeous!
