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RM1899   Staurolite

Montejo de la Sierra, Madrid, Spain

Large crystals of staurolite included in micaceous schist from this classic Spanish area. The formation of metamorphic materials of the Oriental Guadarrama range, with a medium grade regional metamorphism, includes banded shales with almandine, sillimanite, distena and andalusite.

Size: 6.5 x 5 x 3.5 cm.
Main crystal: 42 x 12 mm.
Found in ±1982.