mineral
Tumbled brown banded agate beads
Agate, a banded variety of microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectMohs hardness 6.5–7; brown, gray, and cream concentric or wavy bands; waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage. The beads are polished and drilled, and may be mixed with non-geological beads.
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Physical properties
Mohs hardness 6.5–7; brown, gray, and cream concentric or wavy bands; waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage. The beads are polished and drilled, and may be mixed with non-geological beads.
Formation & geological history
Agate forms when silica-rich fluids deposit successive layers in cavities, commonly in volcanic rocks. Its age varies with the host rock and may range from millions to hundreds of millions of years.
Uses & applications
Used for beads, jewelry, carvings, and decorative objects; agate is also collected as a lapidary material.
Geological facts
Agate’s fine quartz structure gives it both durability and the ability to take a high polish.
Field identification & locations
Look for distinct natural bands and a hard, glassy-to-waxy surface; common sources include Brazil, Uruguay, India, and the United States. A photograph cannot confirm whether these beads are agate or another brown stone such as jasper.
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