Staurolite is a reddish brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and the chemical formula: ...
What is staurolite used for?
It is used in geologic field work to assess the temperature-pressure conditions of a rock's metamorphic history. In locations where staurolite is found as well-formed cruciform twinned crystals, it is sometimes collected, sold as a souvenir, made into jewelry, and used as an ornament.
What mineral is staurolite?
Staurolite, silicate mineral [(Fe,Mg,Zn)3-4Al18Si8O48H2-4] produced by regional metamorphism in rocks such as mica schists, slates, and gneisses, where it is generally associated with other minerals such as kyanite, garnet, and tourmaline. Staurolite is a brittle, hard mineral that has a dull lustre.
