Rock Identifier
Quartzite and Sandstone Pebbles (Silicon dioxide (SiO2)) — metamorphic and sedimentary
metamorphic and sedimentary

Quartzite and Sandstone Pebbles

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Off-white, light gray, beige; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness
7 on Mohs scale
Color
Off-white, light gray, beige
Luster
Vitreous to dull
Identified More metamorphic and sedimentary →
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Physical properties

Hardness: 7 on Mohs scale; Color: Off-white, light gray, beige; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed from the metamorphism of quartz-rich sandstone (quartzite) or the lithification and rounding of sand grains in river or beach environments. Common in ancient sedimentary basins globally.

Uses & applications

Construction aggregate, glass making raw material, flintknapping for primitive tools, and aquarium decor.

Geological facts

Quartzite is one of the most durable rocks on Earth, surviving long-term erosion that destroys other minerals. Sandstone makes up about 10-20% of Earth's sedimentary rock record.

Field identification & locations

Identify by its ability to scratch glass and lack of reaction to acid. Often found in riverbeds, glacial deposits, and beaches. Collectors focus on unique shapes or colors.

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