mineral
Agate Geode Nodule
Chalcedony / Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: variable, often showing banding with gray, blue, white, or brown. Luster: waxy to vitreous. Crystal structure: microcrystalline (agate/chalcedony) and macrocrystalline (quartz center).
- Hardness
- 6
- Luster
- waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: variable, often showing banding with gray, blue, white, or brown. Luster: waxy to vitreous. Crystal structure: microcrystalline (agate/chalcedony) and macrocrystalline (quartz center).
Formation & geological history
Forms in vesicles or cavities within volcanic rocks (like basalt) from silica-rich groundwater depositing layers over time.
Uses & applications
Often cut and polished for lapidary arts, jewelry, decorative items, and collected as mineral specimens.
Geological facts
Agates are varieties of chalcedony characterized by their fine grain and bright color. The center often contains macrocrystalline quartz crystals.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, hardness, and banded structure with a potentially crystalline center. Found worldwide in areas of ancient volcanic activity.
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