Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Anthropogenic Sedimentary (Man Made)
Browse anthropogenic sedimentary (man made) specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Crinoid Fossil in Limestone
Crinoidea (Phylum Echinodermata) in Calcite Matrix (CaCO3)
fossil
Fossilized Shark Tooth
Eocene Lamniformes (Mackerel Shark clade)
fossil
Chert / Flint Pebble
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (SiO2, CaCO3 dominant)
sedimentary
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Crinoidean Fossil (Stem Fragment)
Phylum Echinodermata, Class Crinoidea
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chert (River Stone)
Chert (SiO2)
sedimentary
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Sandstone (lithic/arkosic)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Rounded pebble, likely quartz-rich sandstone or chert
Indeterminate lithic clast; possibly quartz arenite or microcrystalline quartz (SiO₂)
sedimentary
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
sedimentary
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Celestite (Celestine) Geode
Strontium Sulfate (SrSO4)
mineral
Weathered sandstone or iron-stained sedimentary rock
Quartz-rich sandstone, possibly ferruginous sandstone
sedimentary
Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)
Silicon Dioxide (SiO2)
sedimentary
Veined Quartzite / Vein-filled Sedimentary Rock
Siliciclastic rock with iron oxide-filled fractures
sedimentary
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Rounded river or beach pebble
Likely quartz-rich sandstone or quartzite; exact identification requires a close-grained view and hardness test
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral