Chert
Chert
Hard, fine-grained sedimentary rock composed of cryptocrystalline silica.
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First pulled by Cheval, Oct 30, 2026
Not sold on the market yet.
Readers' pathsAug 2026 – Oct 2026
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Flint
Cryptocrystalline form of the mineral quartz.
17%
Siliceous ooze
Biogenic pelagic sediment located on the deep ocean floor.
9.6%
Marl
Lime-rich mud or mudstone which contains variable amounts of clays and silt.
9.5%
Chalcedony
Microcrystalline or cryptocrystalline form of silica.
4%
Jasper
Chalcedony variety colored by iron oxide.
3.7%
Petrified wood
Fossilized remains of plants.
2.9%
Radiolaria
Phylum of single-celled organisms.
2.7%
Sedimentary rock
Rock formed by the deposition and cementation of particles.
2.5%
Mozarkite
State rock of Missouri.
2.4%
Silicon dioxide
Oxide of silicon.
2.2%
Readers come from
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Flint
Cryptocrystalline form of the mineral quartz.
10%
Ötzi
Natural mummy of a Chalcolithic man from Europe.
5.8%
Chalcedony
Microcrystalline or cryptocrystalline form of silica.
5.2%
Banded iron formation
Layered iron-rich sedimentary rock.
4.4%
Agate
Banded variety of chalcedony.
4.4%
Fire striker
Carbon steel for making sparks.
2.4%
Knapping
Technique of manufacturing stone tools.
2.3%
Newfoundland and Labrador
Province of Canada.
2.1%
Marble
Type of metamorphic rock.
1.7%
Mill Creek chert
Type of chert.
1.6%