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285 CTS LARGE LABRADORITE POLISHED SLAB [MGW 2312 ]

11378
4

UGS
Dimensions (mm)
x x mm
Poids (cts)
Certified Gemstones
Non
Couleurs

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 285 cts app

size 74x58x13 mm 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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sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
Mermaid Waters , Australia
Vérifié
19061

  • rustynut
    rustynut
    Positif

    Good stone great service

  • martin11
    martin11
    Positif

    Great thank very much, lovely pearls.

  • philsgems
    philsgems
    Positif

    Nice piece of rough. thankyou

  • philsgems
    philsgems
    Positif

    Nice stone. Thankyou

  • philsgems
    philsgems
    Positif

    Have received the rough. Nice colour. Thankyou

5%
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Valable jusque
2nd Jan 2025

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Les détails d'expédition

Expédition:
$16.00 21 les jours via Registered Shipping
Expédié depuis:
Australia

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Aperçu

Type d'inscription : Standard
Identifiant du produit : 299323
Départs : 21st December 2024 03:00 pm PST
* Tous les prix sont en USD