Staurolite

Fe2Al9Si4O23(OH)

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Staurolite is famous for its cruciform twinned crystals, which form cross-shaped penetration twins. These natural crosses have been collected as good luck charms for centuries. It is an important metamorphic indicator mineral.

Sistema Cristalino Monoclinic
Classe Mineral 09 Silicates
Dureza Mohs 7.0-7.5
Gravidade Específica 3.65-3.77
Cor Dark reddish-brown to black
Brilho Vitreous
Traço Gray to white
Clivagem Poor {010}
Fratura Subconchoidal
Transparência Translucent
Hábito Cristalino Prismatic, cruciform twins

Dureza Mohs

Mohs Hardness: 7,0 – 7,5
1 Soft10 Hard

Sistema Cristalino

Monoclinic

Frequently Asked Questions

What is the hardness of Staurolite?
Staurolite has a Mohs hardness of 7.0-7.5.
What crystal system does Staurolite belong to?
Staurolite crystallizes in the Monoclinic crystal system.
What color is Staurolite?
Staurolite is typically Dark reddish-brown to black.
What type of luster does Staurolite have?
Staurolite exhibits a Vitreous luster.
What is the chemical formula of Staurolite?
The chemical formula of Staurolite is Fe2Al9Si4O23(OH).