Staurolite
Staurolite is a mineral that belongs to the family of nesosilicates, with the chemical formula Fe2+2Al9Si4O23(OH). It is commonly found in metamorphic rocks such as schist and gneiss, and is known for its distinctive cross-shaped twinning, which is why it is sometimes referred to as "fairy crosses." The name staurolite is derived from the Greek ...
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