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.

Kristallsystem Monoclinic
Mineralklasse 09 Silicates
Mohshärte 7.0-7.5
Dichte 3.65-3.77
Farbe Dark reddish-brown to black
Glanz Vitreous
Strichfarbe Gray to white
Spaltbarkeit Poor {010}
Bruch Subconchoidal
Transparenz Translucent
Kristallhabitus Prismatic, cruciform twins

Mohshärte

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

Kristallsystem

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).