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11/03/2022 10:40 am
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Extreamly Rarest 1.40 Ct Natural Blue Grandidierite Madagascar Mined

存货单位
尺寸(毫米)
7.690 x 6.970 x 4.930mm
重量 (cts)
1.400
Treatment
No Treatment
颜色

Grandidierite was first discovered in 1902 in Madagascar by Alfred Lacroix, a French mineralogist. Lacroix named the mineral in honor of French explorer and naturalist Alfred Grandidier (1836–1912), the first authority on the natural history of Madagascar.

Since its initial discovery, samples of Grandidierite have been found in only a few locations around the world, including Malawi, Namibia and Sri Lanka. But the few gem quality specimens have come mainly from Madagascar.

Gem-quality Grandidierite is extremely rare, and it often appears on the list of the 10 rarest varieties in the world, along with gems like jeremejevite, painite, benitoite and taafeite.

Gemologically, Grandidierite is a magnesium aluminum borosilicate. It has a hardness of 7 to 7.5 on the Mohs scale, similar to garnet; a density of 2.85 to 3.00, in the approximate range of tourmaline; and a refractive index of 1.590-1.623.

Name: GRANDIDIERITE GEMSTONE

Place of Origin: MADAGASCAR

TREATMENT: NATURAL


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投标历史 (2)
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概述

列表类型 : Standard
产品编号 : 1781256
预计建议零售价 : $100.00
起拍价 : $1
开始 : 8th March 2022 04:39 am AEST
结束 : 12th March 2022 04:40 am AEST
* 所有价格均以:货币为单位