mineral
Agate Geode with Quartz
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: White, gray, orange-red banding; Luster: Waxy to vitreous; Structure: Microcrystalline (agate) and macrocrystalline (quartz); Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- White, gray, orange-red banding
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: White, gray, orange-red banding; Luster: Waxy to vitreous; Structure: Microcrystalline (agate) and macrocrystalline (quartz); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed as secondary deposits in volcanic rock cavities (vugs). Silica-rich groundwater percolated through the cavity, depositing layers of chalcedony (agate) followed by crystalline quartz over millions of years.
Uses & applications
Decorative display specimens, lapidary arts (cabochons), jewelry, and geological collecting.
Geological facts
The banded layers represent individual pulses of mineral-rich water. The red coloration in the agate bands is typically caused by iron oxide (hematite) inclusions.
Field identification & locations
Look for rounded, potato-like nodules with a rough exterior in volcanic or sedimentary beds. A broken or cut face will reveal the hollow center or internal crystallization. Common in locations like Brazil, Mexico, and the western United States.
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