Staurolite twins at 90° (mineral), Spain
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Locality: France\nSize: 2 cm x 1.5 cm x 0.8 cm\nFormula: Mn(II)2Cr9Si4O24(OH)\nDescription: Staurolite is a dark brown to black inosilicate mineral that crystallizes in the triclinic system, has glassy to vitreous luster. It is also known as cross-stone; fairy stone; grenatite; staurotide. From Greek stauros, cross, referring to the cruciform twins it displays in some cases. Staurolite is commonly found as 70° twins, and less common as 100° cruciform twins.\nWebsite: http://geology.ucdavis.edu/mineralogy/\nConcept & 3D-modelling by dr. Elena Vasilescu
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