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Rare Grandideirite Specimen

Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar.

Optical properties: Biaxial (-)

Category: Nesosilicate

Formula: (Mg,Fe2+)Al3(BO3)(SiO4)O2

Crystal system: Orthorhombic

Color: Bluish green

Dispersion: strong

Hardness: 7 to 7.5

Refractive Index: 1.590 to 1.623

Grandidierite have been found in only a few locations around the world, including Malawi, Namibia and Sri Lanka and few gem quality specimens have come mainly from Madagascar.

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Description

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Grandideirite Specimen

 

Dimension: 54mm x 50mm x 25mm

Weight: 472.45Cts

Mineral: Madagascar

 

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