Mineral
Jasper
Silicon dioxide, SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale), Color: Red, brown, yellow, green, or combination, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz (chalcedony), Cleavage: None (conchoidal fracture), Specific gravity: 2.5-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Red, brown, yellow, green, or combination, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz (chalcedony), Cleavage: None (conchoidal fracture), Specific gravity: 2.5-2.9
Formation & geological history
Formed through the deposition of silica-rich fluids in cracks or cavities, often as a replacement for organic material or in sedimentary environments. Can also form from volcanic activity.
Uses & applications
Commonly used in lapidary arts, jewelry, carvings, and as a decorative stone. Historically used for tools and weapons due to its hardness and ability to hold a sharp edge.
Geological facts
Jasper is an opaque variety of chalcedony. The reddish color in this specimen is likely due to the presence of iron oxide (hematite) impurities.
Field identification & locations
Identified by its waxy to dull luster, opacity, and hardness (can scratch glass). Commonly found worldwide in various geological settings, often tumbled or polished by nature in riverbeds.
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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