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33.95 Carats Natural Rare ~ Grandidierite Cabochons

2408
9

SKU
Afmetingen (mm)
12.000 x 9.000 x 6.000mm
Gewicht (cts)
33.950
Treatment
No Treatment
Kleuren

Grandidierite is a rare mineral that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar

Grandidierites appear bluer in color the more iron (Fe) they contain. A recently discovered gemstone, blue ominelite is the Fe-analogue (Fe, Mg) to grandidierite (Mg, Fe).[4]

Grandidierites display strong trichroic pleochroism. That means they can show three different colors depending on the viewing angle: dark blue-green, colorless (sometimes a very light yellow), or dark green.

While trichroism can usually help distinguish grandidierites from other gems, lazulites can occur with blue-green colors and show colorless/blue/dark blue pleochroism. Nevertheless, lazulites have somewhat higher refractive indices and specific gravity. Grandidierites also have greater hardness.

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gems4selling
gems4selling
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Queens Village , United States of America
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Verzenden:
$60.00 10 dagen via DHL
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Overzicht

Vermeldingstype : Standard
Product-ID : 1351771
Begint : 19th December 2024 08:16 am PST
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