metamorphic
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
Hardness: 7 on Mohs scale; Color: typically white, gray, or tan; Luster: vitreous (glassy) to waxy; Structure: granular, non-foliated; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- typically white, gray, or tan
- Luster
- vitreous (glassy) to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: typically white, gray, or tan; Luster: vitreous (glassy) to waxy; Structure: granular, non-foliated; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the regional metamorphism of quartzose sandstone. Under intense heat and pressure, original quartz grains recrystallize and fuse together, creating an extremely durable rock.
Uses & applications
Commonly used in construction as crushed stone for road ballast, as a component in glass manufacturing, and in its rounded pebble form for landscaping and decorative gardens.
Geological facts
Quartzite is so tough that it often survives intense weathering that destroys other rocks, which is why it is frequently found as rounded river or beach pebbles like the one shown.
Field identification & locations
Identify in the field by its hardness (it will easily scratch glass) and its granular, sugary texture. It is found globally in mountain ranges and ancient metamorphic shields.
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