General Information:
Chemical Formula:(Mg,Fe)2Al12(Al,Fe)2Si4(B,Al)4O37
Environment:Granitic pegmatites cutting granulite-facies metapelitic rocks
IMA Status:Approved IMA
Locality:Cap Andrahomana, near Fort Dauphin, southeastern Madagascar (type locality of grandidierite), and at Almgjotheii, in the aureole of the Rogaland anorthosite complex, southwestern Norwa y.
Physical Properties: Cleavage:[???] Indistinct
Color:brownish yellow.
Density:3.04
Diaphaniety:Translucent
Hardness:7 - Quartz
Luster:Vitreous (Glassy)
Streak:white
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