Staurolite twins at 60° (mineral), Spain
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Locality: Catalonia\nSize: 2 centimeters x 2 centimeters x 1 centimeter\nFormula: Iron aluminate silicate hydrate\Aluminum iron oxide hydroxide\ Silicon dioxide\nDescription: Staurolite is a reddish-brown to black mineral that grows in the monoclinic system, has a glassy luster. It's also known as cross-stone; fairy stone; grenatite; staurotide. From Greek stauros, meaning "cross", it gets its name from the cruciform twins it displays sometimes. Staurolite is often found as 60° twins, and less often as 90° cruciform twins.\nWebsite: http://geology.ro/mineralogie/\nConcept & 3D-modelling by Dr. Andrei Ionut APOPEI
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