Mineral

Mixed Quartz and Jasper Pebbles

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: variety of translucent white, opaque red (Jasper), black, and grey; Luster: vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture.

Hardness: 7 on Mohs scale
Luster: vitreous to waxy

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal precipitation or sedimentary processes where silica-rich fluids fill cavities or replace organic material. These specimens appear to be river-tumbled or mechanically polished pebbles from various geologic ages.

Uses & applications

Commonly used in decorative landscaping, aquarium gravel, lapidary as tumbled stones for 'worry stones,' and basic jewelry (beads/pendants).

Geological facts

Jasper is an impure variety of silica, usually colored red by iron inclusions. Quartz is the second most abundant mineral in Earth's continental crust.

Field identification & locations

Identify in the field by their ability to scratch glass and their smooth, water-worn texture. Often found in riverbeds, glacial till, and coastal beaches globally.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral