mineral

Quartz (Common Quartz Pebble)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan to milky white; Luster: Vitreous to greasy; Crystal Structure: Trigonal (often worn away in pebbles); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Tan to milky white
Luster: Vitreous to greasy

Identified April 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed from cooling magma or precipitation from hydrothermal veins. This specific specimen is a water-worn or weathered pebble likely eroded from a larger vein and tumbled over time.

Uses & applications

Common quartz is used in glass making, abrasives, and as a component in concrete and mortar. Higher quality crystals are used in electronics and jewelry.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. Its name comes from the German word 'quarz', which had its origin in Slavic languages meaning 'hard'.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Look for a waxy or glassy luster on fresh breaks. It is ubiquitous in river beds and sedimentary deposits globally.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral