Mineral
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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
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Physical properties
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.
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.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous