Werdingite

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
More details...