Mineralogy Database

Grandidierite Mineral Data

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General Grandidierite Information

Help on Chemical Formula: Chemical Formula: (Mg,Fe++)Al3(BO4)(SiO4)O
Help on Composition: Composition: Molecular Weight = 296.03 gm
   Magnesium   6.16 %  Mg   10.21 % MgO
   Aluminum   27.34 %  Al   51.67 % Al2O3
   Iron        4.72 %  Fe    6.07 % FeO
   Silicon     9.49 %  Si   20.30 % SiO2
   Boron       3.65 %  B    11.76 % B2O3
   Oxygen     48.64 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.75Fe2+0.25Al3(BO4)(SiO4)O
Help on Environment: Environment: Rare accessory mineral in aluminous boron-rich rocks, thermally and high-grade regionally metamorphosed under low pressure; in pegmatites, aplites, gneisses; in xenoliths.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1902
Help on Locality: Locality: Andrahomana, southwest of Fort Dauphin, southern Madagascar. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alfred Grandidier (1836-1912), French naturalist and explorer, an authority on Madagascar.
Help on Name Pronunciation: Name Pronunciation: Grandidierite + Pronunciation Say GRANDIDIERITE
Help on Synonym: Synonym: ICSD 36064
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