Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Gossan
Ferruginous gossan (Iron-rich capping)
sedimentary
Gossan (Iron Cap)
Limonitic Gossan (Fe2O3·nH2O mixed)
sedimentary
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Chert with Fossil Brachiopod
Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion
sedimentary
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Tiffany Stone
Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)
mineral
River Cobble (likely Metasedimentary or Basalt)
Metamorphosed Siltstone or Altered Fine-grained Igneous Rock
metamorphic
Fossilized Shell Fragment
Bivalvia or Gastropoda (Class) fragment
fossil
Quartz in Matrix (or Quartz Vein Rock)
Silicon Dioxide (SiO2) with host rock
igneous
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Iron-stained quartz-rich rock, likely quartzite or silicified breccia
Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides
metamorphic
Sardonyx Agate Sphere
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
mineral
Granite with Hematite staining
Granitoid (Quartz, Feldspar, Mica) with Iron Oxide (Fe2O3)
igneous
Dendritic Agate
Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions
mineral
Crinoid Stem Fossils (Indian Beads / St. Cuthbert's Beads)
Crinoid columnal ossicles (phylum Echinodermata)
fossil
Weathered fossiliferous sandstone or mudstone cobble
Lithified siliciclastic sediment; the raised curved feature may be a trace fossil or shell impression
sedimentary
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Granitoid (Granite/Gneiss mix)
Phaneritic Felsic Igneous Rock
igneous
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Epidosite (Epidote-Quartz rock)
Epidote-rich hydrothermal rock
metamorphic
Fossilized Crinoid Stem in Limestone
Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix
fossil
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Epidosite
Epidosite (Metasomatic calcium-aluminum silicate rock)
metamorphic
Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone with Crinoid stems
Limestone (CaCO3) containing Crinoidea fossils
sedimentary
Crinoid Fossil in Limestone
Crinoidea fossil (stalk segments) in Calcium Carbonate (CaCO3) matrix
sedimentary
Bivalve Seashell Fossil
Class Bivalvia
fossil
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Quartzite (with Quartz Veining)
Quartzite (SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (goethite)
sedimentary
Copper-bearing Quartz (likely Chrysocolla or Malachite staining)
Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock
mineral
Iron-rich brown stone, possibly weathered chert or ironstone
Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)
sedimentary
Quartzite with Epidote
Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil