metamorphic

Labradorite-bearing gneiss or schist

Feldspathic gneiss/schist containing iridescent labradorite (plagioclase feldspar, NaAlSi₃O₈–CaAl₂Si₂O₈)

AI-generated identification · may be incorrect

Dark gray-black, strongly foliated and flaky, with blue-green-gold iridescence from labradorescent feldspar; glassy to pearly luster, uneven fracture, and Mohs hardness about 6–6.5. Individual mica-rich layers may be softer and peel apart.

Identified September 6, 2026More metamorphic →

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At a glance

Common name: Labradorite-bearing gneiss or schist
Scientific name: Feldspathic gneiss/schist containing iridescent labradorite (plagioclase feldspar, NaAlSi₃O₈–CaAl₂Si₂O₈)
Category: metamorphic
Identified: September 6, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small ordinary specimen; $30–$150+ for attractive, strongly iridescent or well-polished material.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when feldspar- and mica-rich igneous or sedimentary rock underwent high-grade metamorphism, recrystallization, and deformation; the exact geological age is locality-dependent, commonly Precambrian to Paleozoic. The specimen may also be a polished or naturally weathered labradorite-rich rock.

Uses & applications

Used as a decorative stone, carving material, lapidary rough, and collectible; especially attractive pieces are cut into cabochons or polished slabs. Not generally used as aggregate when strongly foliated.

Geological facts

The color flashes are caused by light interference within microscopic lamellae in labradorite, not surface paint. Labradorite-rich metamorphic rocks are notably associated with the Labrador region of Canada and parts of Madagascar, Finland, Norway, and Russia.

Field identification & locations

Look for planar foliation, mica-like flakes, and changing blue-green flashes when tilted under directional light; a glassy feldspar grain and hardness near 6 help distinguish it from coal or slag. Exact identification requires a fresh surface or thin section.