Travertine
Terrestrial Sedimentary Calcite (CaCO3)
Category
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
Travertine
Terrestrial Sedimentary Calcite (CaCO3)
Sandstone River Cobble
Arenite (SiO2 based)
Sandstone
Quartz arenite / Lithic sandstone
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Sandstone
Arenite (SiO2 based)
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Red Sandstone
Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
Jasper
Microcrystalline Quartz (SiO2)
Chert Breccia
Brecciated Chert (Microcrystalline Silica, SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone (Red)
Arenite (Fe2O3 heavy)
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
Breccia
Breccia (Clastic Sedimentary Rock)
Sandstone
Arenite (SiO2 based)
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
Red Jasper with Quartz Vein
Microcrystalline Quartz (SiO2) with Hematite inclusions
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
Sandstone (with Iron Oxide)
Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
Quartzite Pebble
Quartzite (SiO2)
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Crushed Limestone
Calcium Carbonate (CaCO3)
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
Sandstone
Arenite (primarily Quartz Sandstone)
Banded Gneiss
Gneiss (High-grade metamorphic rock)
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
Fossilized Shark Tooth
Chondrichthyes (class)
Fossilized Bone
Vertebrate fossil (mineralized bone)
Breccia Pebble
Sedimentary Breccia
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Laterite
Laterite (Ferricrete / Alcrete)
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
Banded Calcite (Cave Onyx)
Calcium Carbonate (CaCO3)
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
Bivalve Fossil (Internal Mold)
Bivalvia (Phalladomya or similar genus)
River Pebbles and Cobbles
Mixed Siliciclastic Sediments (Quartzite, Chert, and Sandstone clasts)
Red Sandstone
Arenite (Ferruginous Sandstone)