Sandstone
Arenite (SiO2 based typically)
sedimentary
Category
Not A Rock (Synthetic Material)
Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.
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Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)
sedimentary
Abbey Bominable (Monster High character)
Anthropomorphic Yeti / Digital Animation
not a rock (animated character)
Tumbled banded metamorphic stone
Likely banded gneiss or migmatitic gneiss; exact identification requires testing
metamorphic
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Conglomerate
Clastic Sedimentary Conglomerate (SiO2, CaCO3 dominant)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
sedimentary
Laterite Gravel with Quartz
Ferruginous Laterite (Fe2O3·nH2O)
sedimentary
Basalt (Phaneritic or Diabase)
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
River Stone (likely Quartzite or Sandstone)
Metamorphosed Quartz-rich Rock (SiO2)
metamorphic
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite Pebble
Granite (High-silica plutonic rock)
igneous
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Granite
Granite (composed primarily of Quartz, Plagioclase, Alkali Feldspar, and Mica)
igneous
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Rounded gray pebble, likely basalt or andesite
Fine-grained volcanic rock, probably basaltic-andesite; exact identification requires testing
igneous
Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Agate Nodule
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Banded)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Tumbled honey-colored chalcedony or quartzite
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Iridescent schist or phyllite
Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite
metamorphic
Chalcedony (likely iron-stained agate)
Microcrystalline quartz, SiO₂ (chalcedony/agate)
mineral
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Chert (specifically Flint or Jasper-Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Chert (Flint / Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Schist
Lepidoblastic Mica Schist
metamorphic
Geode or Concretion
Silica-rich Concretion or Unopened Geode (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled black stone, likely basalt
Basalt; fine-grained plagioclase–pyroxene rock, possibly with magnetite
igneous