Pyrite penetration twins (mineral), Spain

Pyrite penetration twins (mineral), Spain

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Locality: La Rioja, Navajun, Spain Size: 2 cm x 2 cm x 2 cm Formula: FeS2 Description: Three isometric crystals of the same mineral crystallize together in such a way that they are joined at a common symmetry or crystallographic plane forming a twinned crystal. When two parts of the twinned crystals grow into each other, they are called penetration twin.Pyrite’s brassy golden color led to it being called “Fool’s gold”, but the name of the pyrite comes from the Greek word pyr meaning “fire” because sparks flew from it when struck with another mineral or metal. Website: http://geology.uaic.ro/muzee/mineralogie/ Concept & 3D-modelling by dr. Andrei Ionut APOPEI

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