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Staurolite.
Description from the source:
Staurolite ((Fe+2 Mg Zn)2 Al9 (Si Al)4 O22 (OH)2 mon.), Minas Gerais, Brazil. Single crystal. 1,8x1,5x1,2 cm; 5 g.
Source:
Simone Citon
Contributor:
John Gray
Acquired:
30 September, 2008
Text Updated:
1 October, 2008
Price:
Trade
Size:
0.7"
Composition:
(
Fe
Mg
Zn
)
2
Al
9
(
Si
Al
)
4
O
22
(
O
H
)
2
