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
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 loupe clean
Size: 0.53 x 0.52 x 0.35 cm Weight: 0.66 ct Origin: Near Tranomaro / southern Madagascar Photo by kind permission of © www.americanthai.com |
 |
|
Grandidierite loupe clean
Size: 0.55 x 0.44 x 0.29 cm Weight: 0.40 ct Origin: Near Tranomaro / southern Madagascar Photo by kind permission of © www.americanthai.com |
 |
|
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
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
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
Weight: 0.19 ct Origin: Fort Dauphin / Madagascar Photo by kind permission of © rocklogic.biz/ |
 |
 |
|
Grandidierite
Weight: 0.29 ct Origin: Kolonne / Sri Lanka Photo by kind permission of © www.sinhalite.com |
 |
⇐ Intro Page ⇐ Gemstones