Rock Identifier

Category

Igneous And Fossil

Browse igneous and fossil specimens identified by the Rock Identifier community.

Learn about Igneous And Fossil in the encyclopedia

Fossil Opal

Bone Opal

Turritella Jasper

Amber

Fossiliferous Limestone

Fossiliferous Limestone

Turritella Agate

Turritella Agate

Petrified Wood

Carbonatite

Diatomite

Guano

Jet

Diatomaceous Earth

Sandstone (Arenite (SiO2 based with mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with mineral cements)

Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Arenite (SiO2 with various cementing minerals)) — sedimentary

Sandstone

Arenite (SiO2 with various cementing minerals)

Sandstone (Sandstone (clastic sedimentary rock)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous) (Arenite (with iron oxide cement, Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Sandstone (Red/Brown Variety) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Red/Brown Variety)

Arenite (SiO2 with iron oxide impurities)

Fossil shell fragment (likely brachiopod or bivalve) (Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia) — fossil

Fossil shell fragment (likely brachiopod or bivalve)

Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia

Fossiliferous limestone (Bioclastic micrite/wackestone, likely containing crinoid or shell fragments) — sedimentary

Fossiliferous limestone

Bioclastic micrite/wackestone, likely containing crinoid or shell fragments

Weathered limestone or calcareous sandstone (Calcite-dominated carbonate rock, likely micritic limestone (CaCO₃)) — sedimentary

Weathered limestone or calcareous sandstone

Calcite-dominated carbonate rock, likely micritic limestone (CaCO₃)

Fossilized bone or tooth fragment (indeterminate vertebrate fossil) (Mineralized vertebrate skeletal material; commonly apatite, Ca₅(PO₄)₃(F,Cl,OH), partly replaced by silica or calcite) — fossil

Fossilized bone or tooth fragment (indeterminate vertebrate fossil)

Mineralized vertebrate skeletal material; commonly apatite, Ca₅(PO₄)₃(F,Cl,OH), partly replaced by silica or calcite

Flint / Chert (Silicon Dioxide (SiO2)) — sedimentary

Flint / Chert

Silicon Dioxide (SiO2)

Limestone with Calcite Veining (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Veining

Calcium Carbonate (CaCO3)

Coquina (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Vesicular basalt (weathered scoria) (Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides) — igneous

Vesicular basalt (weathered scoria)

Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides

Vesicular volcanic rock, likely weathered scoria (Scoria (vesicular basaltic-andesitic volcanic rock), composition approximately plagioclase, pyroxene, and volcanic glass) — igneous

Vesicular volcanic rock, likely weathered scoria

Scoria (vesicular basaltic-andesitic volcanic rock), composition approximately plagioclase, pyroxene, and volcanic glass

Petoskey Stone (Hexagonaria percarinata (Fossilized Rugose Coral)) — sedimentary

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossiliferous Limestone (Biogenic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (CaCO3)

Small rounded pebble, likely quartz-rich stone (Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble) — mineral

Small rounded pebble, likely quartz-rich stone

Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble

Greenschist (or Serpentinite with Manganese Dendrites) (Greenschist facies metamorphic rock) — metamorphic

Greenschist (or Serpentinite with Manganese Dendrites)

Greenschist facies metamorphic rock

Weathered limestone or calcitic marble (Calcite-rich carbonate rock, chiefly CaCO₃; likely fossiliferous limestone, possibly weakly metamorphosed marble) — metamorphic

Weathered limestone or calcitic marble

Calcite-rich carbonate rock, chiefly CaCO₃; likely fossiliferous limestone, possibly weakly metamorphosed marble

Weathered limestone or calcareous sandstone (Likely micritic limestone (calcite, CaCO₃), possibly carbonate-rich sandstone) — sedimentary

Weathered limestone or calcareous sandstone

Likely micritic limestone (calcite, CaCO₃), possibly carbonate-rich sandstone

Jasper (likely Kambaba or Crocodile Jasper variety) (Silicon Dioxide (SiO2) with inclusions) — sedimentary

Jasper (likely Kambaba or Crocodile Jasper variety)

Silicon Dioxide (SiO2) with inclusions

Likely petrified wood (Silicified wood, chiefly microcrystalline quartz (SiO₂)) — fossil

Likely petrified wood

Silicified wood, chiefly microcrystalline quartz (SiO₂)

Fossiliferous Flint / Chert (Microcrystalline quartz (SiO2) with embedded invertebrate fossils) — sedimentary

Fossiliferous Flint / Chert

Microcrystalline quartz (SiO2) with embedded invertebrate fossils

Likely limestone fragment (Limestone, predominantly calcite (CaCO₃)) — sedimentary

Likely limestone fragment

Limestone, predominantly calcite (CaCO₃)

Fossiliferous Limestone (Calcium Carbonate (CaCO3) with marine fossils) — fossil

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Sandstone with Trace Fossils (Arenite / Quartzwacke with Ichnofossils) — sedimentary

Sandstone with Trace Fossils

Arenite / Quartzwacke with Ichnofossils

Fossiliferous Limestone (CaCO3 (principally Calcite or Aragonite)) — sedimentary

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Fossiliferous Limestone with Crinoid Stem (Bioclastic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone with Crinoid Stem

Bioclastic Limestone (CaCO3)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Fossiliferous Limestone (Biogenic Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Fossil-bearing limestone (possible shell fossil) (Fossiliferous limestone, composed mainly of calcite (CaCO₃)) — sedimentary

Fossil-bearing limestone (possible shell fossil)

Fossiliferous limestone, composed mainly of calcite (CaCO₃)

Weathered limestone or calcitic cave deposit (Calcite (CaCO₃), likely porous limestone/travertine) — sedimentary

Weathered limestone or calcitic cave deposit

Calcite (CaCO₃), likely porous limestone/travertine

Weathered fossiliferous limestone (Bioclastic limestone, primarily calcite (CaCO₃)) — sedimentary

Weathered fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Fossiliferous Limestone (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Limestone (Calcium Carbonate, CaCO3)

Sandstone and Mixed Rock Assemblage (Clastic Sedimentary Rock / Quartz Arenite) — sedimentary

Sandstone and Mixed Rock Assemblage

Clastic Sedimentary Rock / Quartz Arenite

Sandstone and Gravel Aggregate (Clastic Sedimentary Rock / Quartzose Sandstone) — sedimentary

Sandstone and Gravel Aggregate

Clastic Sedimentary Rock / Quartzose Sandstone