Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Staurolite

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_2329

The composition of staurolite is FeAl4[Si4]2O(OH)2, and it is a product of regional metamorphism. It may contain manganese or cobalt. It crystallizes in the pseudo-orthorhombic crystal system, and the crystals are prismatic. Staurolite is often twinned with a cross-shape or ‘X-shape’, from which it was given the name ‘cruciform stone’. It can be brown or brownish black, and it has a specific gravity of 3.65–3.77 and a Mohs hardness of 7–7.5. It often occurs in crystalline schist and in placer deposits.

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