mineral
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7, Color: Brown/Ochre with dark inclusions and pitting, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7, Color: Brown/Ochre with dark inclusions and pitting, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None
Formation & geological history
Formed from silica-rich fluids in sedimentary or volcanic environments, often colored by iron oxides. This specimen has been naturally smoothed by water action (river rock).
Uses & applications
Lapidary, ornamental stone, collecting
Geological facts
Jasper is an opaque variety of chalcedony. The brown color is typically due to iron impurities.
Field identification & locations
Identify by hardness (scratches glass), opacity, and conchoidal fracture. Often found in riverbeds and beaches where it has been naturally tumbled.
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Pegmatite with Tourmaline and Quartz
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Granite
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Septarian Pebble
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