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Pyrite Penetration Twin

Navajun, located in La Rioja, Spain, is famous for its exceptional pyrite specimens, particularly for the high-quality, large penetration twins. A penetration twin in pyrite occurs when:

Two crystals of pyrite grow together in such a manner that they interpenetrate each other.

They share a common crystallographic plane or axis, where their lattices are symmetrically related but not parallel.

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