Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Mineral, Sediment
Browse mineral, sediment specimens identified by the Rock Identifier community.
Learn about Mineral, Sediment in the encyclopedia
View all →
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda
fossil
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Petrified Wood
Silicified Wood
fossil
Fossil shell fragment
Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image
fossil
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Beach Pebble (Basalt / Greywacke)
Basalt (or fine-grained Sedimentary Greywacke)
igneous
Rounded river pebble
Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock
sedimentary
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Shale
Argillite / Shaly Mudstone
sedimentary
Gravel and Pebbles
Unconsolidated rock fragments (clastic sediment)
sedimentary
Fossil shark teeth
Likely fossilized shark teeth; exact species indeterminate from the image, possibly Carcharhiniformes or related taxa
fossil
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Iron-rich weathered stone, possibly hematite-rich ironstone
Hematite/goethite-bearing ironstone; predominantly Fe₂O₃ and FeO(OH)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Weathered gray sandstone or siltstone
Clastic siliciclastic rock, primarily quartz and feldspar grains cemented by silica or carbonate
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Gastropod Fossil (Snail Stone or Steinkern)
Class Gastropoda (Calcium Carbonate - CaCO3 / Silica - SiO2 replacing original shell)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Ironstone Concretion
Ironstone (primarily Siderite or Limonite)
sedimentary
Sandstone
Arenite
sedimentary
Ironstone concretion
Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Sand (Construction Grade)
Unconsolidated siliciclastic sediment (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Gravel and River Pebbles
Unconsolidated rock fragments / Detrital sediment
sedimentary
Rounded quartz-rich pebble
Likely milky quartz or quartzite (SiO₂)
mineral