mineral

Quartz (Pebble)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: whitish to translucent with brown staining; Luster: vitreous to dull; Fracture: conchoidal

Identified July 23, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: whitish to translucent with brown staining; Luster: vitreous to dull; Fracture: conchoidal

Formed in igneous, metamorphic, or sedimentary environments, subsequently rounded and weathered by stream, river, or coastal wave action.

Used in landscaping, construction aggregate, glassmaking, and decorative pebble collections.

Quartz is one of the most common minerals on Earth's surface and is highly resistant to both chemical and mechanical weathering.

Identified by its hardness (scratches glass), lack of cleavage, and light color with smooth, water-worn edges.

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Schist

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Nephrite Jade

Nephrite