Staurolite

Opaque, cross-shaped staurolite "twins" are used in jewellery more often than the transparent stones, which are rare and cut only for collectors. "Cross-stones", as twins are called, have been used as amulets and in religious jewellery. Crystals are reddish brown to black, with distinct pleochroism.

Staurolite occurs in Switzerland, Germany, the former USSR, United States, Brazil, France and Scotland.

Staurolite Properties

Chemical Composition: 
Aluminium iron hydroxysilicate
Crystal System / Forms: 
Orthorhombic
Hardness: 
7
Specific Gravity: 
3.72
Lustre: 
Vitreous
Refractive Index / Birefringence: 
1.74-1.75 / 0.013
Geological Occurrence: 
Switzerland, Germany, USSR, United States, Brazil, France and Scotland
Cuts & Uses: 
Baguette, Step cut, Cameo.