mineral
Polished banded agate
Agate, a banded variety of chalcedony (microcrystalline SiO₂)
AI-generated identification · may be incorrectMohs hardness 6.5–7; orange, cream, gray, and blue-green bands with a waxy to vitreous polish. Trigonal microcrystalline quartz; no visible cleavage, conchoidal fracture, and specific gravity about 2.6.
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Physical properties
Mohs hardness 6.5–7; orange, cream, gray, and blue-green bands with a waxy to vitreous polish. Trigonal microcrystalline quartz; no visible cleavage, conchoidal fracture, and specific gravity about 2.6.
Formation & geological history
Silica-rich fluids deposited successive layers in cavities, commonly in volcanic rocks; agates formed across many geological ages. The specimen has been cut and polished.
Uses & applications
Used for jewelry, beads, ornaments, and lapidary collections; agate is also used for small decorative and precision objects.
Geological facts
Agate’s layered colors arise from successive silica deposits, and some bands may be colored or enhanced during processing.
Field identification & locations
Recognize agate by its curved or irregular color bands and hard, glassy-to-waxy surface; common sources include Brazil, Uruguay, India, and the United States. This small polished piece cannot be assigned a locality from appearance alone.
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