1.05 CTS KORNERUPINE ROUGH CRYSTALS [MGW3499]

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Certified Gemstone

MINERAL GEM WORLD

KORNERUPINE ROUGH CRYSTALS

This is a nautral untreated specimen of a rare Kornerupien.

Weight 1.05 cts app

Size 8 x 7 x 3 mm app

 

Kornerupine is a rare boro-silicate mineral. It crystallizes in the orthorhombic - dipyramidal crystal system as brown, green, yellow to colorless slender tourmaline like prisms or in massive fibrous forms. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.34. Its indices of refraction are nα=1.660 - 1.671, nβ=1.673 - 1.683 and nγ=1.674 - 1.684.

It occurs in boron-rich volcanic and sedimentary rocks which have undergone high grade metamorphism. It is also found in metamorphosedanorthosite complexes.

$25.00 USD

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Pricing & Details

Auction ID 370435
Watchers 2 watching
Viewed 1,526 times
Starts 18th Jun 2013 7:41pm PDT

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