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.

Kristal Sistemi Monoclinic
Mineral Sınıfı 09 Silicates
Mohs Sertliği 7.0-7.5
Özgül Ağırlık 3.65-3.77
Renk Dark reddish-brown to black
Parlaklık Vitreous
Çizgi Rengi Gray to white
Dilimlenme Poor {010}
Kırılma Subconchoidal
Şeffaflık Translucent
Kristal Alışkanlığı Prismatic, cruciform twins

Mohs Sertliği

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

Kristal Sistemi

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).