Graywacke with Quartz Vein
Lithic Sandstone (Graywacke)
sedimentary
Category
Sedimentary (Base), Then Artificial
Browse sedimentary (base), then artificial specimens identified by the Rock Identifier community.
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Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Manganese staining)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Fossiliferous Limestone / Coral Fossil
Fossiliferous Limestone with Anthozoa (Coral) fossil
sedimentary / fossil
Blue Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Limestone Boulder
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Fossilized Brachiopod
Brachiopoda (e.g., Rhynchonellida or Spiriferida)
sedimentary
Bloodstone
Chalcedony quartz variety (SiO2) with inclusions
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone with Fossil Inclusions
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Limestone River Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Coarse Sandstone Pebble
Clastic Sedimentary Rock (Sandstone)
sedimentary
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Limestone (with Iron-Oxide staining)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Chert Arrowhead (Flint Projectile Point)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Slate
Slate; predominantly fine-grained mica- and clay-mineral rock, commonly derived from shale
metamorphic
Sandstone (lithic/arkosic)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Granite Gneiss
Granitoid Gneiss
metamorphic
Chert (Nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
igneous
Limestone Pebble
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Gold Mineral
Native Gold (Au)
mineral
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Leopard Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (likely Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary