mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous (glassy)

Identified May 31, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from molten magma or hydrothermal veins. Quartz is one of the most abundant minerals on Earth and can be found in all types of environments including igneous, metamorphic, and sedimentary rocks.

Uses & applications

Used in the production of glass, ceramics, and abrasives. High-purity quartz is essential in electronics and semiconductors. While common pebbles have little jewelry value, they are used for decorative landscaping.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Over millions of years, larger pieces of quartz break down and are smoothed into pebbles by the action of water in rivers and on beaches.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Look for 'waxy' or glass-like appearance. It is found globally in riverbeds, beaches, and eroded soil.