sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
AI-generated identification · may be incorrectHardness 6.5 to 7 on Mohs scale, waxy to dull luster, opaque clarity, conchoidal fracture, trigonal crystal structure in microcrystalline form.
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Physical properties
Hardness 6.5 to 7 on Mohs scale, waxy to dull luster, opaque clarity, conchoidal fracture, trigonal crystal structure in microcrystalline form.
Formation & geological history
Formed when fine silicate muds and volcanic ash were petrified under pressure, with iron oxides and other minerals creating landscape-like patterns.
Uses & applications
Used primarily as a lapidary material for cabochons, beads, decorative carvings, and polished slabs for rock collections.
Geological facts
The intricate banding and inclusions in picture jasper often resemble scenic landscapes, deserts, or mountain ranges, making each slice unique.
Field identification & locations
Identify by its opaque microcrystalline quartz texture, smooth fracture surfaces, and distinct scenic or landscape-like color banding (tan, brown, cream, grey). Commonly found in Oregon and Idaho, USA.
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