sedimentary

Possible flint/chert fragment

Microcrystalline quartz (SiO₂), likely chert or flint

AI-generated identification · may be incorrect

Small angular, pale gray-green fragment with a dull to subtly waxy luster and sharp fracture edges. Hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline quartz structure. Identification is limited by the image.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Chert forms when silica-rich groundwater replaces or precipitates within sediment, commonly in limestone; flint is a dark variety of chert. It can range from Precambrian to recent geological ages and occurs as nodules or thin beds.

Uses & applications

Used historically for stone tools and fire-starting, and today as aggregate, decorative stone, and a collector material. This tiny fragment has negligible commercial value.

Geological facts

Its sharp conchoidal fracture and toughness distinguish it from many soft green rocks. The pale color could also indicate altered chert, quartzite, or a weathered manufactured fragment.

Field identification & locations

Field tests include a scratch test against glass, inspection for conchoidal fracture, and checking for a nonpowdery streak; acid reaction would suggest carbonate rather than chert. Common locations include limestone terrains worldwide.