Geode (Unopened)
Silica-rich concretion (SiO2)
sedimentary
Category
Man Made Rock (Sedimentary Analogue)
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
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Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Chert (and Fossiliferous Chert)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz chemical formula SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
River Pebbles / Mudstone
Sedimentary Rock / Silty Claystone
sedimentary
Sandstone Pebble
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz)
sedimentary
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Banded Siltstone
Banded Siltstone / Laminated Siltstone
sedimentary
Lepidodendron Fossil (Scale Tree)
Lepidodendron
fossil
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Crinoid Fossil
Crinoidea (Echinodermata)
fossil
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Mudstone variant)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate
sedimentary
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)
sedimentary
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Precious Opal
Hydrated amorphous silica, SiO2·nH2O
gemstone
Jasper and Chalcedony
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Calcite on Matrix
Calcium Carbonate (CaCO3)
mineral
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary