metamorphic
Quartz-rich metamorphic rock, likely quartzite or vein quartz
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and feldspar
AI-generated identification · may be incorrectHardness about 7 Mohs; pale gray to white with dark inclusions, vitreous to sugary luster, massive interlocking crystals, and no obvious cleavage. The rough, fractured texture and strong contrast suggest a quartz-rich specimen rather than a single clean crystal.
Identified More metamorphic →
Explore Quartz-rich metamorphic rock, likely quartzite or vein quartz in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness about 7 Mohs; pale gray to white with dark inclusions, vitreous to sugary luster, massive interlocking crystals, and no obvious cleavage. The rough, fractured texture and strong contrast suggest a quartz-rich specimen rather than a single clean crystal.
Formation & geological history
Likely formed when quartz-rich sandstone was metamorphosed under heat and pressure, or represents recrystallized hydrothermal quartz in a rock fracture. Its precise geological age cannot be determined from the photograph.
Uses & applications
Used as durable aggregate, dimension stone, landscaping material, and silica source; attractive pieces may be collected or polished, though this specimen appears mainly of geological interest.
Geological facts
Quartzite commonly resists weathering and forms ridges, while quartz veins can host gold and sulfide minerals. Dark areas may be mica, amphibole, iron oxides, or host rock.
Field identification & locations
Identify it by its glassy grains, lack of cleavage, and ability to scratch ordinary glass; a streak, acid, and hardness test would help distinguish quartzite from calcite-bearing rock. Common worldwide in metamorphic belts and hydrothermal vein systems.
More like this
