Sandstone
Arenite (SiO2 principal)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Pink Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Chert / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite / Diorite
Intrusive Igneous Rock (Granitoid / Diorite)
igneous
Basalt Porphyry
Porphyritic Basalt
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Satin Spar (Gypsum)
Gypsum (Satin Spar variety) - CaSO4·2H2O
mineral
Sandstone
Sandstone (composed predominantly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Arenite
sedimentary
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Shale
Argillaceous sedimentary rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Fossil Coral (Favosites)
Favosites (Order: Tabulata, Phylum: Cnidaria)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Desert Varnish on Sandstone
Quartz Arenite with Iron-Manganese Oxide Coating
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous