Sillimanite Flashcards
1
Q
What is sillimanite’s formula?
A
Al2SiO5
2
Q
What is sillimanite’s crystal system?
A
tetrahedral
3
Q
What is sillimanite’s hardness?
A
6.5-7.5
4
Q
What is sillimanite’s cleavage?
A
{010} perfect (pinacoidal)
5
Q
What is sillimanite’s occurrence?
A
pelitic metamorphic rocks
6
Q
What is P/T of sillimanite?
A
high temperature