igneous
Quartz-bearing rock fragment
Undetermined quartz-rich rock; visible white material is likely quartz (SiO₂), with dark fine-grained host rock
AI-generated identification · may be incorrectSmall, rough gray-brown fragment with a white quartz vein or patch. Quartz has Mohs hardness 7, vitreous luster, and hexagonal crystal structure; the host rock cannot be identified reliably from the image.
Identified More igneous →
Explore Quartz-bearing rock fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small, rough gray-brown fragment with a white quartz vein or patch. Quartz has Mohs hardness 7, vitreous luster, and hexagonal crystal structure; the host rock cannot be identified reliably from the image.
Formation & geological history
Likely formed when silica-rich fluids filled a fracture in older rock; age and exact geological setting are unknown.
Uses & applications
As pictured, primarily a hand specimen or teaching/collecting sample; no significant commercial use can be determined.
Geological facts
Quartz veins commonly form when hot, mineral-bearing fluids circulate through cracks and deposit silica as they cool.
Field identification & locations
Look for white, hard material that scratches glass and lacks obvious cleavage. The image is insufficient to determine the host rock or a specific locality.
