Staurolite Flashcards
1
Q
What is Staurolite’s formula?
A
Fe3-4Al18Si8O48H2-4
2
Q
What is Staurolite’s crystal system?
A
monoclinic 2/m
3
Q
What is Staurolite’s form?
A
prismatic crystals {110}
{101} prism
{010} and {001} pinacoids
4
Q
What is Staurolite’s twinning?
A
60 degrees: {231} twin plane
90 degrees: {031} twin plane
5
Q
What is Staurolite’s cleavage?
A
poor on {010}
6
Q
What is Staurolite’s hardness?
A
7-7.5
7
Q
What is Stuarolite’s occurrences?
A
pelitic metamorphic rocks
