metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Grayish-white with brownish weathering; Luster: Vitreous to dull; Crystal structure: Non-foliated granoblastic; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Grayish-white with brownish weathering
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Grayish-white with brownish weathering; Luster: Vitreous to dull; Crystal structure: Non-foliated granoblastic; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz sandstone under intense heat and pressure, causing the original quartz grains to recrystallize and fuse together. Typically found in mountain belts or as rounded river/beach pebbles.
Uses & applications
Used in construction as crushed stone or ballast, as an abrasive, and sometimes for decorative landscaping. Historically used for stone tools due to its hardness and durability.
Geological facts
Quartzite is so tough that it often breaks through the original sand grains rather than around them. It is one of the most chemically and physically resistant rocks on Earth's surface.
Field identification & locations
Identify in the field by its extreme hardness (it will scratch glass easily) and granular sugary appearance. Common in riverbeds and glacial deposits. Collectors look for unique colors or smooth weathering.
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