metamorphic
Quartzite Pebbles with Quartz Veining
SiO2 (Silicon Dioxide with country rock matrix)
Hardness: 7 on Mohs scale. Color: White, grey, light brown, and dark grey-black. Luster: Vitreous to dull. Crystal Structure: Trigonal/Microcrystalline. Cleavage: None, exhibits conchoidal to uneven fracture. Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- White, grey, light brown, and dark grey-black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: White, grey, light brown, and dark grey-black. Luster: Vitreous to dull. Crystal Structure: Trigonal/Microcrystalline. Cleavage: None, exhibits conchoidal to uneven fracture. Specific Gravity: ~2.65.
Formation & geological history
Formed when quartz-rich sandstone undergoes intense heat and pressure during regional metamorphism, fusing quartz grains together. Quartz veins cut through due to hydrothermal fluids filling fractures during tectonic activity. Subsequently rounded by river or glacial erosion.
Uses & applications
Commonly used as construction aggregate, landscaping pebbles, road base material, and for lapidary polishing/tumbling by rockhounding enthusiasts.
Geological facts
Quartzite is one of the most durable and weathering-resistant rocks on Earth, often forming high ridges and mountain peaks because surrounding softer rocks erode away first.
Field identification & locations
Look for a hard, smooth, river-worn surface with distinct white vein-like quartz patterns intruding into darker metamorphic or sedimentary rock. Can be found along riverbeds, beaches, and glacial till deposits worldwide.
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