General Information:
Chemical Formula:
(Mg,Fe++)Al3(BO4)(SiO4)O
Empirical Formula:
Mg0.75Fe2+0.25Al3(BO4)(SiO4)O
Environment:
Pegmatite.
Locality:
Andrahomana, southwest of Fort Dauphin, southern Madagascar.
Physical Properties:
Cleavage:
[100] Good, [010] Good
Color:
bluish green.
Density:
2.976
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
7.5 - Garnet
Luster:
Vitreous (Glassy)
Streak:
white
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