mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to yellowish-tan with iron staining; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent white to yellowish-tan with iron staining
Luster: Vitreous to waxy

Identified July 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen shows rounding and smoothing characteristic of alluvial or glacial transport over thousands of years.

Uses & applications

Common quartz is used in construction as aggregate, in glassmaking, and in electronics for its piezoelectric properties. This specific pebble is primarily a collector's pocket stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The yellowish spots on this specimen are likely inclusions of iron oxide (limonite) or hematite trapped within the crystal structure or surface cracks.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Look for the 'greasy' or waxy luster on weathered surfaces. Frequently found in riverbeds, beaches, and gravel pits globally.