Orthoclase

specimen number:
2102253

location:
West Maroon Pass, Pitkin Co., Colorado, USA

description:
A set of two blocky loose double terminated twinned orthoclase crystals. Both are in very good condition with no points of attachment or damage. Size provided is in average.

Twinning in orthoclase occurs when two or more crystals share a common lattice point in a symmetrical manner, typically resulting from structural stresses or temperature changes during crystallization from a melt. Geologically, these twins are most common in granitic pegmatites and volcanic rocks where the cooling process allows for specific geometric intergrowths. The most famous varieties include Carlsbad twins, which are penetration twins where two crystals appear to grow through one another along a shared axis, and Manebach or Baveno twins, which are contact twins joined along specific crystallographic planes. Because orthoclase is a monoclinic feldspar, these twinning patterns are essential diagnostic tools for geologists and mineralogists to identify the mineral in thin sections or hand specimens.

Questions about this specimen?
Send an email or call us: 314-341-1811.