mineral

Polished picture jasper (likely a jasper-and-chalcedony slab)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; brown, cream, and turquoise-green areas with a waxy to vitreous polish. Quartz has a trigonal crystal structure; jasper is typically opaque and lacks visible cleavage. The image may show dyed or resin-treated material, so the green color cannot be confirmed as natural.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace sediment, often incorporating iron oxides that create earthy patterns. Its age and exact formation setting cannot be determined from the image.

Uses & applications

Cut and polished for slabs, cabochons, beads, and decorative objects; jasper is also used as an ornamental stone.

Geological facts

Jasper’s patterns arise from mineral impurities and contrasting layers; “picture jasper” is a trade name for specimens with landscape-like designs.

Field identification & locations

Look for hardness near 7, no cleavage, and opaque patterned interiors; verify suspected dye by examining color concentration along cracks or edges. Jasper occurs worldwide, including the United States, Brazil, India, and Madagascar.