Staurolite

Question 1

What is Staurolite’s formula?

Answer 1

Fe3-4Al18Si8O48H2-4

Question 2

What is Staurolite’s crystal system?

Answer 2

monoclinic 2/m

Question 3

What is Staurolite’s form?

Answer 3

prismatic crystals {110}
{101} prism
{010} and {001} pinacoids

Question 4

What is Staurolite’s twinning?

Answer 4

60 degrees: {231} twin plane

90 degrees: {031} twin plane

Question 5

What is Staurolite’s cleavage?

Answer 5

poor on {010}

Question 6

What is Staurolite’s hardness?

Answer 6

7-7.5

Question 7

What is Stuarolite’s occurrences?

Answer 7

pelitic metamorphic rocks