mineral
Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale; Color: Varies widely including grey, white, blue, brown, red; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline quartz)
- Hardness
- 6
- Color
- Varies widely including grey, white, blue, brown, red
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Varies widely including grey, white, blue, brown, red; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline quartz)
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks, often occurring in concentric bands over millions of years
Uses & applications
Used primarily in jewelry, ornamental carvings, polished display specimens, and industrial bearings
Geological facts
Agate was named by Theophrastus, a Greek philosopher and naturalist, who discovered the stone along the shoreline of the Achates River in Sicily
Field identification & locations
Identified by its distinctive concentric banding and waxy luster; commonly found worldwide in volcanic rock cavities or ancient lava flows
More like this
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