mineral
Likely tumbled labradorite
Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectGray-blue, polished pebble with reflective flecks; hardness 6–6.5 Mohs, vitreous luster, triclinic crystals and two cleavage directions. The image is too small to confirm the characteristic broad blue-green iridescence (labradorescence).
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Physical properties
Gray-blue, polished pebble with reflective flecks; hardness 6–6.5 Mohs, vitreous luster, triclinic crystals and two cleavage directions. The image is too small to confirm the characteristic broad blue-green iridescence (labradorescence).
Formation & geological history
Forms by crystallization in mafic igneous rocks, especially gabbro and anorthosite; deposits range from Precambrian to recent geological settings.
Uses & applications
Used for jewelry, carvings, ornamental stone, and mineral collecting; larger slabs may be used decoratively.
Geological facts
Its vivid color flashes arise from light interference in fine internal layers, rather than surface coating.
Field identification & locations
Often found in anorthosite and related rocks; confirm with pronounced color flashes under changing light and feldspar cleavage. Not enough detail is visible to identify the stone definitively.
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