Banded Chert
Silicon dioxide (SiO2)
sedimentary
Category
Mineral Or Sedimentary (If Chert)
Browse mineral or sedimentary (if chert) specimens identified by the Rock Identifier community.
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Weathered chert (flint) pebble
Microcrystalline quartz (SiO₂), likely chert
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
mineral
Chert (Concretion or Nodular Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Carnelian
Carnelian (Chert/Chalcedony) - SiO2
mineral
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), possibly colored by iron oxides
mineral
Banded Chert / Jasper Cognation
Microcrystalline Quartz (SiO2) with Hematite/Limonite
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Polished/Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
mineral
Chert (Yellow Jasper / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Chert (Septarian Nodules-like)
Silicon dioxide (SiO2)
sedimentary
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Banded Iron Formation
Banded Iron Formation (BIF), typically composed of magnetite, hematite, and chert
sedimentary
Weathered quartz-rich pebble, possibly granite or granodiorite
Felsic intrusive rock; chiefly quartz, feldspar, and minor mica/amphibole
igneous
Chert (Quartz Variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Chert (likely a small flake)
Microcrystalline quartz (SiO₂); the flake-like shape alone does not establish whether it is naturally fractured or worked
sedimentary
Weathered iron-rich metamorphic rock, possibly schist or metabasalt
Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing
metamorphic
Chert (Common Opal/Agate inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Likely tumbled orange-brown jasper or chert
Microcrystalline quartz (SiO₂), probably iron-oxide-bearing jasper
mineral
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red jasper / red chert
Microcrystalline quartz (chalcedony), SiO₂, colored chiefly by iron oxides
sedimentary
Tumbled chert or flint
Microcrystalline quartz (SiO₂), commonly chalcedony with possible iron-oxide inclusions
sedimentary
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert with Quartz Veining
Microcrystalline silica (SiO2)
sedimentary
Flint / Chert with Cortex
Microcrystalline Quartz (SiO2)
sedimentary
Yellow-brown jasper (likely iron-stained chert)
Microcrystalline quartz (SiO₂), commonly called jasper when opaque and colored by impurities
sedimentary