mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: White, tan, or milky; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, tan, or milky
Luster: Vitreous to waxy (when weathered)

Identified April 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluids in igneous or metamorphic environments. This specific specimen is a water-worn pebble, indicating it has undergone significant erosion and transport in a river, stream, or beach environment over thousands of years.

Uses & applications

Used in glassmaking, electronics, or as an abrasive. In pebble form, mostly used in landscaping, construction aggregate, or as a common collector piece for beginners.

Geological facts

Quartz is one of the most abundant minerals on Earth's crust. It is highly resistant to chemical and physical weathering, which is why it often remains as pebbles long after other minerals have broken down into clay.

Field identification & locations

Identify by its hardness (it will scratch glass) and its lack of cleavage. Commonly found in riverbeds, beaches, and gravel pits worldwide. Collectors should look for unique inclusions or clarity.