mineral

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: tan to creamy white; Luster: vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: tan to creamy white
Luster: vitreous (glassy) to waxy

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: tan to creamy white; Luster: vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous rocks like granite. This specimen appears water-worn or tumbled, likely from a fluvial (river) or beach environment.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), jewelry as semi-precious stones, and widely collected as pocket stones or decorative gravel.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as pebbles after other minerals have eroded.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and soil worldwide. This smooth shape indicates significant transport by water.