mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: semi-translucent yellow to cream; Luster: waxy to vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: semi-translucent yellow to cream
Luster: waxy to vitreous

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: semi-translucent yellow to cream; Luster: waxy to vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed through the cooling of magma or precipitation from hydrothermal veins. This specific specimen has been Rounded and smoothed by high-energy water environments like rivers or beaches over thousands of years.

Uses & applications

Primarily used as decorative gravel, in landscaping, and as a common collectible for beginner rockhounds. Industrial quartz is used in glassmaking and electronics.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These smooth 'river stones' were once sharp fragments that lost their edges through constant abrasion against other rocks.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, glacial till, and coastal beaches globally. Look for translucency when held up to a light source.