Anthracite Coal
Anthracite
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Green calcite (likely)
Calcite, calcium carbonate (CaCO₃)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Dendritic Chert
Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)
sedimentary
Sandstone
Arenite (SiO2 with various cementation agents)
sedimentary
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (River Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)
sedimentary
Siderite Concretion (Nodule)
Iron Carbonate (FeCO3) Concretion
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Belemnite Fossil
Belemnitella sp. (rostrum)
fossil
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structures, SiO2)
fossil
Calcite-rich limestone fragment
Limestone, predominantly calcite (CaCO₃), possibly micritic or fossiliferous
sedimentary
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil
Crinoid Stem Fossil in Matrix
Phylum Echinodermata, Class Crinoidea
fossil
Pyrite
Iron Pyrite (FeS2)
mineral
Sandstone with attached barnacles
Quartz sandstone (Silicon Dioxide - SiO2 matrix)
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Dendritic Jasper (River Stone)
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae within Microcrystalline Quartz)
sedimentary
Anthracite Coal
Anthracite (Metamorphosed Bituminous Coal)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
sedimentary
Tumbled amber
Amber (fossilized plant resin), chiefly polymerized diterpenoid resin
gemstone
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (containing a small fossil)
Microcrystalline Quartz (SiO2)
sedimentary