metamorphic
Weathered foliated metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and mineral tests
AI-generated identification · may be incorrectHardness about 6–7; brown, tan, gray, and rusty colors with weathered foliation and possible quartz/feldspar-rich bands. Likely crystalline, with weak-to-moderate cleavage along mica-rich layers and specific gravity roughly 2.6–2.8.
Identified More metamorphic →
Explore Weathered foliated metamorphic rock, likely gneiss or schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness about 6–7; brown, tan, gray, and rusty colors with weathered foliation and possible quartz/feldspar-rich bands. Likely crystalline, with weak-to-moderate cleavage along mica-rich layers and specific gravity roughly 2.6–2.8.
Formation & geological history
Formed when preexisting igneous or sedimentary rock underwent substantial heat and pressure, producing foliation and recrystallization; age cannot be determined visually and may range from Precambrian to younger.
Uses & applications
Commonly used as dimension stone, landscape rock, riprap, and aggregate; attractive polished pieces may be used decoratively, but this specimen appears too weathered for high-end jewelry.
Geological facts
The rusty coloration likely reflects oxidation of iron-bearing minerals such as biotite or amphibole. The surface texture may obscure the original banding, so it could also represent strongly weathered gneiss or schist.
Field identification & locations
Look for aligned mica flakes, alternating light quartz/feldspar and dark mineral bands, a glassy quartz component, and a scratch resistance near quartz. Common worldwide in regional mountain belts and ancient continental shields; a thin-section or fresh fracture would improve identification.
More like this
