Mineral
Agate
SiO2
AI-generated identification · may be incorrectHardness: 6.5-7, Color: Gray, white, yellow, brownish, 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: Gray, white, yellow, brownish, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline
Formation & geological history
Formed in nodules in volcanic rocks or ancient lavas, often filling cavities produced by the release of volatiles in the molten rock.
Uses & applications
Used in jewelry, typically cut into cabochons or beads. Also collected by rock enthusiasts.
Geological facts
Agate is a banded form of finely-grained, microcrystalline Quartz.
Field identification & locations
Identify by its waxy luster, hardness (can scratch glass), and characteristic banded or mottled patterns. Commonly found worldwide in volcanic areas.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary