Magnesiodumortierite

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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