metamorphic
Weathered quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), possibly quartzite with iron-oxide and dark-mineral inclusions
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to cream, vitreous to dull from weathering, with irregular fracture and no visible cleavage; specific gravity about 2.65. The specimen appears porous and heavily weathered, with dark patches and rusty staining.
Identified More metamorphic →
Explore Weathered quartz-rich rock, possibly milky quartz or quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically Mohs hardness 7, white to cream, vitreous to dull from weathering, with irregular fracture and no visible cleavage; specific gravity about 2.65. The specimen appears porous and heavily weathered, with dark patches and rusty staining.
Formation & geological history
Quartzite forms when quartz sandstone is recrystallized during metamorphism; milky quartz forms from silica-rich hydrothermal fluids filling fractures. An exact geological age and origin cannot be determined from the photograph.
Uses & applications
Common quartzite is used for aggregate, paving, building stone, and sometimes decorative pieces; attractive quartz specimens are collected but this example appears low-grade.
Geological facts
Dark spots may be iron-manganese oxides, mica, or other inclusions rather than metallic material. A steel file should not easily scratch fresh quartz surfaces.
Field identification & locations
Common in metamorphic terrains, stream gravels, and hydrothermal veins worldwide; test hardness, inspect a freshly broken surface, and use a hand lens to distinguish quartz grains from other minerals.
More like this
