metamorphic
Quartzite Pebble
Metamorphic Quartz (SiO2)
Hardness: 7 (Mohs scale); Color: Grayish-white to tan; Luster: Vitreous to waxy; Structure: Granulose texture with interlocking quartz grains; Non-foliated; High specific gravity around 2.65.
- Hardness
- 7 (Mohs scale)
- Color
- Grayish-white to tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Grayish-white to tan; Luster: Vitreous to waxy; Structure: Granulose texture with interlocking quartz grains; Non-foliated; High specific gravity around 2.65.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen has been further shaped and smoothed by river or beach water erosion (water-worn).
Uses & applications
Used as aggregate in construction, as a decorative stone in landscaping, or as high-quality building stone. Polished versions are used in jewelry and rock collections.
Geological facts
Quartzite is so durable that it often outlasts the mountain ranges in which it was formed, frequently surviving as pebbles in riverbeds long after surrounding softer rocks have eroded away.
Field identification & locations
Identify in the field by its hardness (it can scratch glass easily) and its sugary/granular appearance when broken. Very common in regions with ancient mountain belts or glacial deposits.
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