metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white to light gray with some iron oxidation staining; Luster: vitreous to dull; Crystal structure: hexagonal/trigonal; Cleavage: none, conchoidal fracture. Specific gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- white to light gray with some iron oxidation staining
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white to light gray with some iron oxidation staining; Luster: vitreous to dull; Crystal structure: hexagonal/trigonal; Cleavage: none, conchoidal fracture. Specific gravity: 2.6-2.7.
Formation & geological history
Formed from the metamorphism of quartz sandstone under intense heat and pressure. The individual quartz grains recrystallize into a dense interlocking mosaic. Found in ancient mountain belts and glacial till.
Uses & applications
Industrial use in glassmaking, construction aggregate, and as a durable decorative stone or landscaping material.
Geological facts
Quartzite is so tough that it often survives multiple cycles of erosion, which is why it is frequently found as rounded river or beach pebbles as seen in this image.
Field identification & locations
Identify in the field by its extreme hardness (it will easily scratch glass and steel) and its grainy, crystalline appearance which lacks the smooth, waxy feel of chert. Commonly found in riverbeds and glacial deposits.
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