metamorphic

Dark metamorphic rock, likely schist or gneiss

Mica schist/gneiss; commonly quartz + feldspar + biotite, with possible amphibole

AI-generated identification · may be incorrect

Gray-black, coarse-grained, with visible light mineral bands and a possible foliated or layered texture; likely Mohs 6–7, vitreous to dull luster, variable cleavage from mica, and specific gravity about 2.7–3.0.

Identified September 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or igneous rock was subjected to substantial heat and pressure during mountain building, typically hundreds of millions to billions of years ago. The image does not permit confident distinction between schist and gneiss.

Uses & applications

Used as dimension stone, landscaping rock, wall stone, and aggregate; attractive polished pieces may be collected, though this specimen appears ordinary rather than gem-grade.

Geological facts

Alternating dark and light mineral bands indicate metamorphic differentiation; shiny surfaces may reflect mica or freshly fractured quartz/feldspar.

Field identification & locations

Look for planar foliation, mineral alignment, and contrasting light-dark bands. Common in ancient mountain belts and exposed crystalline terrains worldwide; a streak, hardness, and close inspection of layering would improve identification.