sedimentary
Flint
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically dark gray or black with a waxy luster and conchoidal fracture.
Identified More sedimentary →
Explore Flint in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, typically dark gray or black with a waxy luster and conchoidal fracture.
Formation & geological history
Formed as nodules in sedimentary rocks like chalk through the replacement of calcium carbonate by silica-rich solutions.
Uses & applications
Historically used for making stone tools and fire-starting; currently utilized in landscaping, ceramics, and abrasives.
Geological facts
Flint played a critical role in human technology during the Stone Age due to its ability to be chipped into sharp edges.
Field identification & locations
Identified by its distinct conchoidal fracture and ability to spark when struck against steel; found globally in chalk and limestone deposits.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary