mineral

Quartz pebble

Silicon dioxide (SiO2)

Hardness of 7 on Mohs scale, typically white or translucent, vitreous luster, lacks cleavage, conchoidal fracture.

Identified August 9, 2026More mineral →

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Physical properties

Hardness of 7 on Mohs scale, typically white or translucent, vitreous luster, lacks cleavage, conchoidal fracture.

Forms in igneous, metamorphic, and sedimentary rocks; pebbles are smoothed by water action in streams or beaches.

Used in glassmaking, electronics, construction materials, and lapidary arts.

Quartz is the second most abundant mineral in Earth's continental crust.

Identified by its hardness (scratches glass), lack of cleavage, and typical white or clear appearance. Found commonly in riverbeds and beaches.

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

Septarian Pebble

Septarian nodule / Concretion

Schist