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RM2544   Orthoclase, Karlsbad twin
#1994
La Machota Baja, Zarzalejo, Madrid, Comunidad de Madrid, Spain

A huge size orthoclase crystal, showing defined prism and pinacoidal faces, with the karlsbad twin. We think it is glued on its place on the matrix, but it is not visible. Crystal is on this porphyry granite-adamellite, part of the potent dykes with large phenocrysts of potassium feldspar (orthoclase) of great perfection. A classic Spanish locality for the species.

Size: 5.5 x 4.8 x 3.5 cm.
Main crystal: 3.4 x 1.9 cm.
Found in ±1975.
Col. J. Astor, Barcelona.
Classic locality
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