General Information:
Chemical Formula:
(Mg,Ti++++,[ ])<1(Al,Mg)2Al4Si3O18-y(OH)yB y=2-3
Environment:
In pyrope megablasts which occur in coesite bearing quartz-phengite-kyanite schists.
IMA Status:
Approved IMA
Locality:
Dor-Maira massif, western Alps, Italy.
Name Origin:
For its containing magnesium and the relationship to dumortierite.
Physical Properties:
Cleavage:
[001] Poor
Color:
pinkish red or red.
Density:
3.22
Diaphaniety:
Transparent
Habits:
Disseminated - Occurs in small, distinct particles dispersed in matrix., ,
Hardness:
7.5 - Garnet
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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