metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Hardness: 7 on Mohs scale; Color: Pinkish-tan, brownish-orange; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-tan, brownish-orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pinkish-tan, brownish-orange; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. This specimen shows significant rounding and smoothing due to fluvial (river) or glacial transport processes which happened over millions of years.
Uses & applications
Used as decorative gravel in landscaping, as an abrasive, and sometimes in construction as a sturdy aggregate. Tumbled versions are popular for rock collections.
Geological facts
Quartzite is so hard that it can scratch steel and glass. It is often harder than the parent sandstone from which it originated. It is one of the most resistant rocks to chemical weathering.
Field identification & locations
Identify in the field by its hardness and granular, sugary texture. It will not fizz with acid, distinguishing it from marble. Found commonly in riverbeds and areas with ancient structural uplift.
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