grandidierite
Sign in to saveGrandidierite 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. thumb|left|A large, faceted grandidierite, a 429.87 carat stone owned by a Filipino collector Benedicto G. Membrere V. GIL Report certificate number STN201811139168.
Key facts
- Mineral.name
- Grandidierite
- Mineral.image
- Grandidierite-169886.jpg
- Mineral.caption
- Tabular crystals of grandidierite from the type locality in Madagascar
- Mineral.category
- Nesosilicate
- Mineral.formula
- (Mg,Fe2+)Al3(BO3)(SiO4)O2
- Mineral.IMAsymbol
- Gdd
- Mineral.strunz
- 9.AJ.05
- Mineral.dana
- 54.01.01.01
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Pbnm
- Mineral.color
- Cyan to turquoise; bluish green
- Mineral.habit
- Tabular
- Mineral.twinning
- none
- Mineral.cleavage
- Good
- Mineral.fracture
- Brittle
- Mineral.mohs
- 7.5
- Mineral.luster
- Vitreous, glassy
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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. thumb|left|A large, faceted grandidierite, a 429.87 carat stone owned by a Filipino collector Benedicto G. Membrere V. GIL Report certificate number STN201811139168.
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).