mineral

Quartz pebble

Silicon dioxide, SiO2

Hardness of 7 on Mohs scale. Pale brownish/tan color with vitreous luster, showing conchoidal fracture.

Identified August 25, 2026More mineral →

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Physical properties

Hardness of 7 on Mohs scale. Pale brownish/tan color with vitreous luster, showing conchoidal fracture.

Formed from silica-rich fluids crystallizing in veins or pegmatites, later eroded and rounded by water action in a river or coastal environment.

Common quartz is used in glassmaking, construction, and electronics, though this piece has only minor collecting value.

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

Identified by its hardness (scratches glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till globally.

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Calcite–fluorite mineral specimen with iron-oxide staining

Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides

Mineral Sand (Heavy Mineral Sand Concentrate)

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

Septarian Pebble

Septarian nodule / Concretion

Granite

Granite (Phaneritic intrusive igneous rock)