igneous
Weathered granitic rock (likely granite or granodiorite)
Granite–granodiorite; mainly quartz, feldspar, and mica/hornblende
AI-generated identification · may be incorrectCoarse, speckled white-gray and dark texture with a dull, weathered surface; interlocking crystalline structure and no obvious layering. Typical hardness is about 6–7 Mohs; specific gravity roughly 2.6–2.8; cleavage occurs in feldspar, but not as a whole rock.
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Physical properties
Coarse, speckled white-gray and dark texture with a dull, weathered surface; interlocking crystalline structure and no obvious layering. Typical hardness is about 6–7 Mohs; specific gravity roughly 2.6–2.8; cleavage occurs in feldspar, but not as a whole rock.
Formation & geological history
Slow cooling of silica-rich magma deep underground formed the crystals, later exposed and rounded by weathering and transport. The specimen is probably Paleozoic–Mesozoic in broad regional context, though an exact age cannot be determined visually.
Uses & applications
Commonly used as building stone, paving, aggregate, monuments, and countertops; attractive pieces may be collected but this small weathered fragment has little commercial value.
Geological facts
The dark grains are likely biotite mica or amphibole, while the pale grains are feldspar and quartz. The reported location in the Pyrenees is geologically plausible for granitic rocks and metamorphic terrain.
Field identification & locations
Look for visible interlocking pale quartz/feldspar crystals and dark mica or hornblende, unlike sedimentary layering. A streak, hardness, and fresh broken surface would improve identification; it may also be a metamorphic gneiss if hidden banding appears.
