mineral
Agate Slab
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7, Color: banded (brown, white, grey, clear), Luster: waxy to vitreous, Crystal structure: cryptocrystalline, Cleavage: none, Specific gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7, Color: banded (brown, white, grey, clear), Luster: waxy to vitreous, Crystal structure: cryptocrystalline, Cleavage: none, Specific gravity: 2.58-2.64
Formation & geological history
Formed in cavities of volcanic rocks or ancient lavas, primarily as silica deposited from groundwater. Often found in Brazil, as indicated by the sticker.
Uses & applications
Commonly used for lapidary work, jewelry, coasters, and decorative display pieces.
Geological facts
Agate is a variety of chalcedony characterized by its banding. The inner cavity often contains drusy quartz crystals, as seen in this specimen.
Field identification & locations
Identified by its distinctive concentric banding and translucency when sliced thin. Brazil is one of the world's leading producers of agate.
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Sandstone (with potential mineral staining/concretions)
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Pegmatite with Tourmaline and Quartz
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Septarian Pebble
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