mineral
Tumbled chalcedony (likely pale agate)
Microcrystalline quartz, SiO₂; agate is banded chalcedony
AI-generated identification · may be incorrectOpaque cream-white stone with orange-brown mottling and a smooth, waxy-to-dull polish. Mohs hardness 6.5–7; trigonal quartz structure; no obvious cleavage, conchoidal fracture; specific gravity about 2.6.
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Physical properties
Opaque cream-white stone with orange-brown mottling and a smooth, waxy-to-dull polish. Mohs hardness 6.5–7; trigonal quartz structure; no obvious cleavage, conchoidal fracture; specific gravity about 2.6.
Formation & geological history
Silica-rich fluids deposited quartz in cavities and fractures, later weathered and rounded; agate deposits form in many geological ages, commonly in volcanic rocks. The image alone does not establish a precise variety or age.
Uses & applications
Used for lapidary carvings, beads, cabochons, and decorative objects; common pieces are primarily collectible.
Geological facts
Agate is chalcedony with distinct curved or concentric bands, but visible banding is not clear in this specimen.
Field identification & locations
Look for hardness near 7, a waxy luster, and conchoidal fracture; agate commonly occurs in volcanic geodes and stream gravels. This rounded, polished-looking piece appears to be a small lapidary specimen.
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