Amber
Succinrite (Organic Gemstone)
mineraloid
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Likely weathered sandstone fragment
Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement
sedimentary
Rounded yellow-brown pebble
Likely iron-stained sandstone or quartz-rich river cobble
sedimentary
Crushed Stone / Greywacke
Greywacke (Indurated Sandstone)
sedimentary
Orthoceras fossil in limestone
Orthoceras (extinct genus of cephalopod)
sedimentary
Jasper (Red/Brown)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Ferruginous Sandstone Concretion (Ironstone Phosphorite)
Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)
sedimentary
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Rounded quartz-rich pebble
Likely quartzite or quartz-rich sandstone pebble; SiO₂-dominant
sedimentary
Greywacke
Lithic Wacke
sedimentary
Pebble (likely Limestone or Siltstone)
Lithic fragment (calcareous or siliciclastic)
sedimentary
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Graywacke
Graywacke/Lithic Sandstone
sedimentary
Graywacke
Graywacke
sedimentary
Echinoidea (Fossil Sea Urchin)
Echinodermata Echinoidea
sedimentary
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil
Crinaudite / Fossilized Crinoid Stem
Crinoid (Echinodermata) in a Calcitic/Siliceous Matrix
sedimentary
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Tumbled reddish sandstone pebble
Quartz-rich sandstone, likely ferruginous arkose or quartz arenite
sedimentary
Banded Siltstone or Mudstone
Clastic Sedimentary Rock (Siltstone/Argillite)
sedimentary
Glauconite
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Bivalve Internal Mold Fossil
Steinkern (Mollusca: Bivalvia)
fossil
Fossilized Gastropod in Limestone
Gastropoda (Class) in Calcium Carbonate (CaCO3)
sedimentary
Jasper (specifically Owyhee or Picture Jasper variety)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Shale
Sedimentary pelitic rock
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Likely iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides
sedimentary
Ironstone concretion
Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)
sedimentary
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Iron-rich flint or chert fragment
Microcrystalline quartz (SiO₂), likely ferruginous chert
sedimentary
Chert or flint nodule
Microcrystalline quartz (SiO₂), likely chalcedony-rich chert
sedimentary