Chert (varieties: Flint, Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Chert (Flint)
Chert (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon)
sedimentary
Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Orbicular jasper (orbicular chert), likely ocean jasper
Silicified microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and/or clay-rich orbicules
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Chert Nodule (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (variously Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO₂)
sedimentary
Fossil shark teeth
Likely fossilized shark teeth; exact species indeterminate from the image, possibly Carcharhiniformes or related taxa
fossil
Hematite
Hematite (Fe2O3)
mineral
Orange Calcite (likely polished specimen)
Calcite
Mineral
Chert (Flint Nodule)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Polished brown jasper (probable picture jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions
mineral
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Banded Sandstone (River Pebble)
Clastic Sedimentary Rock (SiO2 with impurities)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Dendritic jasper/chalcedony
Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites
mineral
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Red Chert/Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (and Chalcedony/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized bivalve shell
Recrystallized calcium-carbonate shell, commonly fossil oyster or clam (Bivalvia)
fossil
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Chert
Microcrystalline silica (SiO2)
sedimentary
Likely weathered basaltic rock or slag-like volcanic specimen
Fine-grained mafic rock, probably basalt; exact identification requires testing
igneous
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossil tooth, likely shark tooth
Likely fossilized shark tooth (possibly a small lamniform shark; exact taxon cannot be confirmed from the image)
fossil
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Anthracite Coal
Anthracite coal (High-rank coal)
sedimentary
Yellow jasper or iron-stained chert
Microcrystalline quartz (SiO₂), commonly colored by goethite/limonite and other iron oxides
mineral
Anthracite
Anthracite Coal
sedimentary
Polished ocean jasper (orbicular jasper)
Orbicular jasper; chiefly microcrystalline quartz (SiO₂) with chalcedony, iron oxides, and accessory minerals
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral