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
via Wikipedia infobox
Wikidata facts
- Subclass of
- nesosilicates
- Named after
- Alfred Grandidier
- Image
- Grandidierite-169886.jpg
Show 8 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.AJ.05
- Nickel-Strunz 9th edition (updated 2009)
- 9.AJ.05
- Commons category
- Grandidierite
- streak color
- white
- crystal system
- orthorhombic crystal system
- IMA Mineral Symbol
- Gdd
- chemical formula
- (Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
- Strunz 8th edition (series ID, updated)
- VIII/A’.13
via Wikidata · CC0
~1 min read
Encyclopedic overview
2 sectionsContents
- See also
- References
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).
Excerpted from Wikipedia’s “grandidierite” article, available under the CC BY-SA 4.0 licence.