metamorphic
Quartzite Pebble
Quartzite (composed primarily of SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: tan to light orange, Luster: dull to vitreous when wet, Structure: non-foliated crystalline, Cleavage: none (conchoidal fracture), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: tan to light orange, Luster: dull to vitreous when wet, Structure: non-foliated crystalline, Cleavage: none (conchoidal fracture), Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure, typically during mountain-building events. This specimen has been rounded by fluvial or coastal erosion.
Uses & applications
Used in construction as a decorative aggregate, in the glass industry as a source of silica, and as a durable outdoor landscaping material.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks in a landscape, forming resistant ridges. In a pebble state, it is harder than steel and will scratch glass easily.
Field identification & locations
Identified by its sugary texture and extreme hardness. It won't react with acid (unlike limestone) and is much harder than similar-looking calcite. Found abundantly in riverbeds and on beaches worldwide.
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