mineral
Banded agate (likely moss or plume agate)
Microcrystalline quartz (SiO₂), chiefly chalcedony
AI-generated identification · may be incorrectOpaque to translucent white, brown, and dark gray chalcedony bands; waxy to dull luster and no visible cleavage. Quartz hardness is 7 Mohs; specific gravity is about 2.6, with microcrystalline/trigonal quartz structure.
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Physical properties
Opaque to translucent white, brown, and dark gray chalcedony bands; waxy to dull luster and no visible cleavage. Quartz hardness is 7 Mohs; specific gravity is about 2.6, with microcrystalline/trigonal quartz structure.
Formation & geological history
Silica-rich fluids deposited successive layers in a cavity or fracture, later hardening into chalcedony. The image alone cannot establish its geological age or exact locality.
Uses & applications
Commonly cut and polished for cabochons, carvings, and display pieces; agate is also used in ornaments and occasionally precision components.
Geological facts
Agate is a variety of chalcedony, and its banding records changing conditions during silica deposition.
Field identification & locations
Look for curved or irregular contrasting bands and a smooth, waxy surface; a fresh cut or polish often makes patterns clearer. Agates occur worldwide in volcanic rocks and sedimentary deposits; the specific variety is uncertain from this view.
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