Mineral
Agate
Agate (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness: 6.5-7, Color: Various (this specimen is tan, cream, and faint blue/gray), Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline
- Hardness
- 6
- Luster
- Waxy to vitreous, Crystal structure: Cryptocrystalline
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Physical properties
Hardness: 6.5-7, Color: Various (this specimen is tan, cream, and faint blue/gray), Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline
Formation & geological history
Formed in nodules in volcanic rocks or ancient lavas, in former gas cavities, from siliceous fluids.
Uses & applications
Frequently used in lapidary arts, wire-wrapping, and jewelry making, like the pendant shown.
Geological facts
Agate is a common variety of chalcedony with characteristic banding or varied colors due to trace minerals.
Field identification & locations
Identify by its waxy luster, hardness (will scratch glass), and typical patterned or banded translucent appearance.
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Granite
Granite (Phaneritic intrusive igneous rock)
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Septarian Pebble
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