sedimentary
Quartz Druzy in Chert Pebble
Silicon Dioxide (SiO2) - Microcrystalline & Crystalline Quartz
Hardness: 7 on Mohs scale. Color: Tan/brown host stone with sparkling white to clear quartz crystals inside a vug. Luster: Vitreous to dull. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: Tan/brown host stone with sparkling white to clear quartz crystals inside a vug. Luster: Vitreous to dull. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
Formation & geological history
Formed as a chemical sedimentary deposit (chert/flint nodule) in marine limestone or chalk beds, with a hollow cavity (vug) where secondary hydrothermal or groundwater silica precipitates grew sparkling quartz crystals.
Uses & applications
Lapidary projects, decorative specimens, educational display, and rockhounding collection.
Geological facts
The sparkling inner pocket is called a druse or druzy cavity. While weathered on the outside into a smooth river pebble, the protected pocket preserves pristine quartz crystal faces.
Field identification & locations
Look for rounded, fine-grained tan or gray nodules with small exposed pockets or crystalline windows. Common in gravel bars, riverbeds, and limestone quarry regions worldwide.
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