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.

Sistem Kristal Monoclinic
Kelas Mineral 09 Silicates
Kekerasan Mohs 7.0-7.5
Berat Jenis 3.65-3.77
Warna Dark reddish-brown to black
Kilap Vitreous
Gores Gray to white
Belahan Poor {010}
Pecahan Subconchoidal
Transparansi Translucent
Bentuk Kristal Prismatic, cruciform twins

Kekerasan Mohs

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

Sistem Kristal

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).