Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
sedimentary
Granite
Granite
igneous
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Jasper mix)
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert Nodules (with Flint core)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Chert/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
igneous
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Sandstone
Arenite (SiO2 based)
sedimentary
Granite cobble
Granite (Felsic Plutonic Rock)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Granite
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Sandstone (Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Note regarding image quality
Indeterminate
Granite
Felsic intrusive igneous rock
igneous
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Vein in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Granite
Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Vesicular volcanic rock, likely scoria
Scoria; composition commonly basaltic to andesitic, rich in plagioclase and pyroxene
igneous
Quartz Veined Jasper
Microcrystalline quartz (SiO2) with calcium carbonate or quartz veins
sedimentary
Dendritic sandstone
Sandstone with Manganese Oxide dendrites
sedimentary
Agate
Silicon Dioxide (SiO2)
sedimentary