Jasper (Chert / Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Category
Sedimentary (Anthropogenic)
Browse sedimentary (anthropogenic) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Anthropogenic) in the encyclopedia
View all →
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)
Anhydrite (Calcium Sulfate, CaSO4)
Mineral
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Shale
Mudrock / Pelite
sedimentary
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Shale (with Iron Staining)
Argillaceous mudstone / Shale
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide cement)
sedimentary
Shale
Fissile Mudstone
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Weathered sandstone or siltstone cobble
Clastic sedimentary rock, probably quartz-rich sandstone; exact identification requires testing
sedimentary
Weathered shale or mudstone
Clastic mudrock, chiefly clay minerals, quartz, and feldspar
sedimentary
Polished fossil-bearing shale or mudstone
Fossiliferous carbonaceous mudstone/shale; visible fossils may be bivalves or ammonites, but species cannot be confirmed from the image
fossil
Banded sandstone pebble
Quartz-rich sandstone, likely iron-oxide- and organic/mineral-stained; exact variety uncertain
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
metamorphic
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered sandstone fragment
Quartz-rich sandstone (compositionally uncertain)
sedimentary
Chert / Flint Arrowheads
Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Belemnite Fossil
Belemnitida (rostrum)
fossil
Small pale stone, possibly quartz or limestone
Indeterminate from image; likely quartz (SiO₂) or calcite-rich limestone (CaCO₃)
mineral
Rounded sandstone or quartz-rich sedimentary pebble
Likely quartz arenite/subarkose; exact identification requires testing
sedimentary
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Fossil-bearing rock, possibly with a fossilized shell or coralline specimen
Indeterminate fossil in sedimentary matrix; precise identification is not possible from the image
fossil
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Polished brown river pebble (likely chert or fine-grained sandstone)
Indeterminate; probable microcrystalline quartz (chert) or quartz-rich sandstone
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Weathered Sandstone Cobble
Arenite / Quartz Sandstone
sedimentary
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil