Limestone
Sedimentary rock composed primarily of calcium carbonate (CaCO3)
Category
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
Limestone
Sedimentary rock composed primarily of calcium carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Sandstone pebble
Clastic sedimentary rock (primarily SiO2)
Sandstone
Arenite (SiO2 based)
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
Sandstone
Arenite (mostly SiO2)
Sandstone
Arenite (typically SiO2 + others)
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
Sandstone
Arenite (primarily SiO2)
Limestone (specifically Fossiliferous Limestone)
Calcium Carbonate (CaCO3)
Sandstone
Arenite (SiO2 based)
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (principally SiO2)
Sandstone
Arenite (primarily SiO2)
Conglomerate
Conglomerate (Sedimentary Rock)
Sandstone (with vugs)
Arenite / Sedimentary Sandstone
Obsidian
Obsidian (Volcanic Glass)
Obsidian
Volcanic Glass (Rich in SiO2)
Granite
Phaneritic plutonic rock (composed primarily of Quartz, Feldspar, and Mica)
Chondrite Meteorite
Ordinary Chondrite (S-type asteroid origin)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
Porous quartz-rich rock, likely weathered rhyolite or silicified volcanic breccia
Rhyolite or volcanic breccia; predominantly microcrystalline quartz (SiO₂) with altered feldspar and iron oxides
Quartz-rich breccia or vein quartz with dark inclusions
Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals
Sandstone
Arenite
River Rock (Greywacke/Sandstone)
Lithic Wacke
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
Sandstone
Arenite
Sandstone pebble
Sandstone (siliciclastic sedimentary rock)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Sandstone
Arenite (primarily SiO2)
Sandstone (Quartzite Pebble)
Arenite (SiO2)
Quartz-veined Sandstone
Sedimentary rock with quartz vein (SiO2)
Weathered Sandstone with Algae Growth
Arenite
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (SiO2 based)
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
Porphyry
Porphyritic Igneous Rock
Red Sandstone Pebble
Sedimentary quartz sandstone