Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
View all →
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary
Pyrite in Slate or Shale
Iron Sulfide (FeS2) in Argillaceous Matrix
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Concretion
Septarian or Siderite Concretion
sedimentary
Cobaltoan Calcite / Pink Dolomite (Possible)
Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))
Mineral / Rock (depending on purity)
Jasper
Silicon dioxide (SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Agate (Moss or Dendritic Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified Wood (mainly Quartz/Chalcedony, SiO2)
fossil
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Fossiliferous Sandstone / Mudstone
Sedimentary Rock (Clastic with Fossiliferous Inclusions)
sedimentary
Agate (Moss or Green Agate)
Silicon Dioxide (SiO2)
mineral
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Chert with Quartz Vein
Silicon dioxide (SiO2)
sedimentary
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Geode (Unopened)
SiO2 (Quartz-filled Sedimentary Nodule)
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Pyrite in Shale
Iron Sulfide (FeS2) in Sedimentary Matrix
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Travertine (Tufa)
Chemical Sedimentary Rock (CaCO3)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
River Cobble (Sandstone)
Arenite (primarily SiO2)
sedimentary