Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
sedimentary
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
sedimentary
General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)
Anhydrite (Calcium Sulfate, CaSO4)
Mineral
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Quartz (Milky/Yellowish variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite
igneous
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Amethyst Geode Fragment
Amethyst (Silicon Dioxide, SiO2) with Quartz matrix
mineral
Quartz Pebble (with iron staining)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Slate or Metamorphic Rock
Metamorphic rock (chlorite/actinolite-bearing)
metamorphic
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Sandstone Pebble
Sandstone (SiO2 rich clastic rock)
sedimentary
Sandstone
Sandstone (composed mainly of Quartz, SiO2, and Feldspar)
sedimentary
Weathered sandstone or limestone fragment
Likely quartz-rich sandstone or micritic limestone; exact identification requires testing
sedimentary
Sandstone (Pebble)
Sandstone (composed mainly of Quartz, SiO2, with feldspar and lithic fragments)
sedimentary
Sandstone (Calcareous)
Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe-oxide cement)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Banded Agate
Silicon Dioxide (SiO2)
sedimentary