metamorphic
Weathered schist or gneiss fragment
Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss
AI-generated identification · may be incorrectCoarse, foliated texture with silvery reflective mica, pale quartz/feldspar, and rusty iron-oxide weathering. Typical hardness is about 2–7 depending on mineral; mica splits readily, while quartz is glassy and hard.
Identified More metamorphic →
Explore Weathered schist or gneiss fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, foliated texture with silvery reflective mica, pale quartz/feldspar, and rusty iron-oxide weathering. Typical hardness is about 2–7 depending on mineral; mica splits readily, while quartz is glassy and hard.
Formation & geological history
Formed when preexisting sedimentary or igneous rock underwent elevated heat and pressure, producing foliation; commonly Precambrian to Paleozoic in age, though age cannot be determined from the image.
Uses & applications
Used locally as building stone, landscaping material, wall stone, or aggregate; attractive mica-rich pieces may be collected, but this specimen appears of modest commercial value.
Geological facts
The planar layering and glittering flakes strongly indicate metamorphic foliation rather than a massive igneous rock. Rust-colored edges reflect oxidation of iron-bearing minerals.
Field identification & locations
Look for aligned mica flakes, planar splitting, alternating light and dark bands, and quartz veins; distinguish it from slate by its coarser grains and stronger sparkle. Common in regional metamorphic belts worldwide.
More like this
