Grandidierite

Grandidieriet, Grandidierit, Grandidierita, Грандидьерит, 復合磺


Commonly known      rarer (so called collectors stones)      very rare (rarities)      extremely rare (world rarities)
relatively rare organic material





Formula: (Mg,Fe2+)Al3(BO3)(SiO4)O2
Mineral class: silicates
Crystal system: orthorhombic
Mohs scale: 7.5
Density /g/cm3: 2.98 - 3.01
Refractive index: 1.583 - 1.639
Cleavage: very good
Colors: colorless, greenish, blueish
Luster: vitreous
Fluorescence: -
Pleochroism:
X: dark blue to green-blue, Y: colorless, Z: ligth green-blue to dark green
Largest faceted, eye-clean Grandidierite: 0.29 ct
Deposits:
Madagascar: 9 deposits, e.g. Andrahomana / Ranopiso Dep. / Anosy Reg. / Tuléar Prov. / Madagascar (type locality),
Algeria, Antarctica, Canada, Germany, Greenland, India, Italy, Malawi, New Zealand, Norway, Slovakia, South Africa, Sri Lanka, Surinam, USA, Zimbabwe
Discovery: 1902
1st Description: 1902 (A. Lacroix)
Name: in honor of the French naturalist and explorer Alfred Grandidier (1836 - 1912)
............................................................................................. .......................................
Andrahomana / Ranopiso Dep. / Anosy Reg. / Tuléar Prov. / Madagascar

Größere Kartenansicht

Grandidierite Mineral

Size: 2.01 x 2.30 x 2.03 cm

Origin: Nampona Quarry / Bezavona / Taolañaro / Anosy Reg. / Tuléar Prov. / Madagascar

Photo by kind permission of © www.civilminerals.com
Grandidierite Mineral
Grandidierite

Size: 1.15 x 1.14 x 0.5 cm
Weight: 4.31 ct
Origin: Fort Dauphin / Madagascar

Photo by kind permission of © www.freakingcat.com

Grandidierite Mineral

Origin: Andrahomana / Ranopiso Dep. / Anosy Reg. / Tuléar Prov. / Madagascar

Photo by kind permission of © www.irocks.com
Grandidierite Mineral
Grandidierite

Size: 0.38 x 0.38 x 0.17 cm
Weight: 0.06 ct
Origin: Fort Dauphin / Madagascar

Photo by kind permission of © www.freakingcat.com

Grandidierite Mineral

Origin: Madagascar

Photo by kind permission of © www.caltech.edu/
Grandidierite Mineral
Grandidierite

Weight: 0.19 ct

Origin: Fort Dauphin / Madagascar

Photo by kind permission of © rocklogic.biz/

Grandidierite

Size: 0.6 x 0.4 cm

Weight: 0.33 ct

Photo by kind permission of © www.kox-gems.com

Grandidierite

Weight: 0.29 ct

Origin: Kolonne / Sri Lanka

Photo by kind permission of © www.sinhalite.com


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