sedimentary
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
Hardness: 6.5-7 (Mohs); Color: Brown to tan with white streaks; Luster: Dull/waxy; Structure: Cryptocrystalline; Specific Gravity: 2.65
- Hardness
- 6
- Color
- Brown to tan with white streaks
- Luster
- Dull/waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brown to tan with white streaks; Luster: Dull/waxy; Structure: Cryptocrystalline; Specific Gravity: 2.65
Formation & geological history
Formed as chemical precipitates from silica-rich fluids in sedimentary basins, often containing secondary white quartz or calcite veins filling fractures.
Uses & applications
Historically used for stone tools; currently used as landscaping rock, road base, and for pebble collecting.
Geological facts
This specimen shows 'veining' where the rock cracked and minerals precipitated in the gaps. Chert is a tough, durable rock that often survives long transport in rivers.
Field identification & locations
Identify by its hardness (it can scratch glass and steel) and smooth, conchoidal fracture patterns. Commonly found in riverbeds and on beaches.
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