$470.00 USD
預計建議零售價:rrp
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24/11/2022 08:55 pm
3294
11

46.90CTS DUMORTIERITE ROUGH SPECIMEN RARE MINERAL RG-4221

存貨單位
尺寸(毫米)
23.700 x 23.600 x 17.000mm
重量 (cts)
46.900
Treatment
No Treatment
顏色

DUMORTIERITE

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
raregems
raregems, all rough
:城市,國家
已驗證
:總反饋

  • wtakano
    wtakano
    積極的

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

  • bainesrh
    bainesrh
    積極的

    Beautiful gemstone

  • fireflyz
    fireflyz
    積極的

    Beautiful stone! Thank you so much!

  • gvioletto
    gvioletto
    積極的

    Paid and shipped - no feedback left after 100 days

  • gvioletto
    gvioletto
    積極的

    Paid and shipped - no feedback left after 100 days

40%
優惠券代碼 BLACKFRIDAY24
有效期至
3rd Dec 2024

審計

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送貨細節

船運:
$30.00 :通過 Standard Shipping - Tracked 計算天數
發貨自:
Australia

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概述

列表類型 : Standard
產品編號 : 994720
開始 : 23rd November 2022 09:55 pm PST
* 所有價格均以:貨幣為單位