sedimentary
Jasper / Chert Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, waxy to dull luster, conchoidal fracture, and yellowish-tan to brown coloration.
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Physical properties
Hardness 6.5-7 on Mohs scale, waxy to dull luster, conchoidal fracture, and yellowish-tan to brown coloration.
Formation & geological history
Formed via chemical precipitation of silica from groundwater or oceanic settings, subsequently rounded by water erosion.
Uses & applications
Commonly tumbled for ornamental jewelry, landscaping gravel, or collected by lapidary hobbyists.
Geological facts
Jasper varieties obtain their earth-toned colors from microscopic iron oxide and hydroxide inclusions.
Field identification & locations
Identified by high hardness (scratches glass/steel), lack of visible crystalline grain, and smooth, water-worn texture found along riverbeds and beaches.
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