mineral

Polished labradorite

Labradorite, a calcic plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to brown body color with polished vitreous luster and subtle blue-green iridescence (labradorescence). It has triclinic crystal structure and two cleavage directions, though the pictured tumbled piece has rounded edges.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as gabbro, basalt, and anorthosite as magma cools; its exact geological age depends on locality, with major deposits ranging from Precambrian to younger formations.

Uses & applications

Used as ornamental stone, cabochons, beads, polished décor, and occasionally architectural facing; this specimen is jewelry/collecting material rather than a structural rock.

Geological facts

Its internal lamellar twinning produces interference colors when light enters at the proper angle; the subdued flash here may reflect orientation, surface finish, or lower-grade material.

Field identification & locations

Identify it by gray feldspar appearance, strong cleavage, hardness near steel nail/glass range, and blue-green or gold flashes when tilted under a focused light. Common sources include Labrador, Canada; Finland; Madagascar; Norway; and Ukraine.