gemstone
Polished picture jasper
Microcrystalline quartz (SiO₂), an opaque jasper variety
AI-generated identification · may be incorrectMohs hardness 6.5–7; brown, gold, and cream swirling patterns; dull to vitreous polish; cryptocrystalline quartz with no visible cleavage; specific gravity about 2.6.
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Physical properties
Mohs hardness 6.5–7; brown, gold, and cream swirling patterns; dull to vitreous polish; cryptocrystalline quartz with no visible cleavage; specific gravity about 2.6.
Formation & geological history
Forms when silica-rich fluids cement or replace volcanic ash and sediment, preserving flow, landscape, or dendritic patterns. Most jasper is Paleozoic to Mesozoic or younger, depending on locality.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and decorative objects; generally inexpensive but attractive patterned pieces are collectible.
Geological facts
The pictured specimen is tumbled and polished, so its natural texture and hardness are partly obscured. “Picture jasper” is a trade name for jasper displaying scenic or abstract patterns.
Field identification & locations
Identify by its opaque body, fine-grained texture, glassy polish, and resistance to scratching; it should not show quartz-like transparency or cleavage. Common sources include Oregon, Idaho, Utah, Arizona, Mexico, Madagascar, and Australia.
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