Grandidierite

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Grandidierite:

Grandidierite is the One the Most expensive and rare gemstone in the world, and it is one the rarest top 10 gemstone Types in the world, Grandidierite It forms in the orthorhombic crystal system; it is typically bluish-green in colour and distinctive colour from traces of iron. Grandidierite is the most favourite gemstone for gem collectors and love to add their collection, but it has been almost difficult to find, Grandidierite is an extremely unusual mineral and gem by having a breathtaking colour that is blue-green. Although it is very rarely transparent, faceted, translucent gems have actually a colour that is beautiful. The type locality and many wells understood location is Andrahomana, southwest of Fort Dauphin, southern Madagascar. Other sources that are minor Kachenbere Hills, Malawi; Béjaia, Algeria; Ontario, Canada; Warren County, NY, USA; Tuscany, Italy; Masataka, Surinam; Cuvier Island, brand new Zealand and Norway.

PROPERTIES OF GRANDIDIERITE

Chemical Composition: (Mg,Fe2+)Al3(BO3)(SiO4)O2

(Magnesium Iron Aluminum Boro-Silicate)

Hardness: 7.5Moh

Specific Gravity (Density): 2.98 – 2.99 (g/cm3)

Refractive Index: 1.590 – 1.639 Biaxial ( – )(DR)

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