$70.00 USD
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24/11/2022 08:51 pm
2718
11

7CTS DUMORTIERITE ROUGH SPECIMEN RARE MINERAL RG-4216

存货单位
尺寸(毫米)
19.600 x 7.700 x 7.400mm
重量 (cts)
7.000
Treatment
No Treatment
颜色

DUMORTIERITE
TERMINATED CRYSTAL

NICE PALE  BLUE COLOUR

FINE CRYSTAL SPECIMEN


Dumortierite is a fibrous variably colored aluminium boro-silicate mineral, Al7BO3(SiO4)3O3. Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals. The crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink. Substitution of iron and other tri-valent elements for aluminium result in the color variations. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartzcontaining abundant dumortierite inclusions.

Dumortierite was first described in 1881 for an occurrence in Chaponost, in the Rhône-Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873).[4] It typically occurs in high temperature aluminium rich regional metamorphic rocks, those resulting from contact metamorphism and also in boron rich pegmatites. The most extensive investigation on dumortierite was done on samples from the high grade metamorphic Gfohl unit in Austria by Fuchs et al. (2005).

It is used in the manufacture of high grade porcelain. It is sometimes mistaken for sodalite and has been used as imitation lapis lazuli.

Sources of Dumortierite include Austria, Brazil, Canada, France, Italy, Madagascar, Namibia, Nevada, Norway, Peru, Poland, Russia and Sri Lanka.


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raregems, all rough
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:总反馈

  • wtakano
    wtakano
    积极的

    Much nicer in person than in the photo. I am happy to include these into my gemstone family!

  • bainesrh
    bainesrh
    积极的

    Beautiful gemstone

  • fireflyz
    fireflyz
    积极的

    Beautiful stone! Thank you so much!

  • gvioletto
    gvioletto
    积极的

    Paid and shipped - no feedback left after 100 days

  • gvioletto
    gvioletto
    积极的

    Paid and shipped - no feedback left after 100 days

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有效期至
3rd Dec 2024

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概述

列表类型 : Standard
产品编号 : 994713
开始 : 23rd November 2022 09:47 pm PST
* 所有价格均以:货币为单位