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125 CTS LARGE LABRADORITE POLISHED SLAB [MGW 2323 ]

存貨單位
尺寸(毫米)
x x mm
重量 (cts)
Certified Gemstones
顏色

LABRADORITE

Labradorite is truly a fascinatingly beautiful mineral which reminds me of black opal. Its a mineral whose charm is not fully noticed and may be overlooked if not viewed from the proper position. Generally a dull, dark looking mineral with no special virtue until the colorful shiller is observed glowing on the surface. Labradorite can produce a colorful play of light across cleavage planes and in sliced sections called labradorescence. The usually intense colors range from the typical blues and violets through greens, yellows and oranges. This is a polished specimen that has a rough back-it can be polished or left as a specimen.Bright flashy colours but only at certain directions.

Mined in Madagascar.

Weight 125  cts app

size 60x30x12mm app

The color display is from lamellar intergrowths inside the crystal. These intergrowths result from compatible chemistries at high temperatures becoming incompatible at lower temperatures and thus a separating and layering of these two phases. The resulting color effect is caused by a ray of light entering a layer and being refracted back and forth by deeper layers. This refracted ray is slowed by the extra travel through the layers and mixes with other rays to produce a light ray coming out that has a different wavelength than when it went in. The wavelength could correspond to the wavelength of a particular color, such as blue. The effect depends on the thickness and orientation of the layers. If the layers are too thick or too thin no color shiller is seen. Also if the viewer does not observe from the precise angle or if light is not supplied from the proper angle then no color shiller is seen. The labradorescence is truly a one of a kind mineralogical experience and must be observed in person in order to truly appreciate its beauty.

Labradorite is a member of the plagioclase series of minerals. The plagioclase series comprises felspars f that range in chemical composition from pure NaAlSi3 O8 to pure CaAl2 Si2 O8 . Labradorite is defined at approximately the 50% to 70% CaAl2 Si2 O8 . Labradorite by definition must contain 50-70% calcium to 50-30% sodium in the sodium/calcium position of the crystal structure. All members of the plagioclase series usually display lamellar twinning called "Albite Twinning". The twinning   is caused by a error in the crystal structure during its growth.

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mineralgemworld
mineralgemworld
MEMBER OF THE [ICA]  INTERNATIONAL COLOURED STONE ASSOCIATION AND PRESIDENT OF THE OPAL ASSOCIATION. We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
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  • lizzielovescrystals
    lizzielovescrystals
    積極的

    Nice polish, brighter in the picture but still beautiful, rough on the bottom, very pretty, fast shipping and speedy service, thank you.

投標歷史 (1)
lizzielovescrystals
之前從該賣家購買過
6 years ago
$26.00

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概述

列表類型 : Standard
產品編號 : 299334
起拍價 : $28
開始 : 11th December 2017 09:00 am AEST
結束 : 12th December 2017 11:03 am AEST
* 所有價格均以:貨幣為單位