sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
Hardness 6.5-7 on Mohs scale. Color ranges from brownish-olive green to tan with white quartz inclusions. Luster is waxy to vitreous. Conchoidal fracture with smooth, water-worn exterior.
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Physical properties
Hardness 6.5-7 on Mohs scale. Color ranges from brownish-olive green to tan with white quartz inclusions. Luster is waxy to vitreous. Conchoidal fracture with smooth, water-worn exterior.
Formation & geological history
Formed via chemical precipitation or biological accumulation of silica in aquatic environments, followed by compaction and diagenesis. Frequently rounded by river or wave erosion.
Uses & applications
Commonly collected as river pebbles, used in landscaping, aggregate, and historically for flintknapping tool production.
Geological facts
Chert is composed of microscopic silica crystals. Because of its cryptocrystalline nature, it fractures like glass, making it one of humanity's earliest toolmaking resources.
Field identification & locations
Identified by its high hardness, smooth texture, waxy appearance, and resistance to scratching by steel. Common in riverbeds, gravel deposits, and coastal shores globally.
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