Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Category
Organic (Pseudo Geological)
Browse organic (pseudo geological) specimens identified by the Rock Identifier community.
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert / Jasper
Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz or Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Light Variety)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Chert / Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Amber (likely rough amber)
Fossilized tree resin; composition varies, commonly rich in polymerized terpenoids
gemstone
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Possible petrified wood or fossilized tooth
Unidentified silicified fossil; exact identification requires close examination
fossil
Seashell Fossil
Gastropoda fossil
fossil
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Limestone Concretion
Calcium Carbonate Concretion (CaCO3)
sedimentary
Red coral beads (possibly dyed or imitation coral)
Corallium spp. skeleton, composed mainly of calcium carbonate (calcite); exact material cannot be confirmed from the image
gemstone
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Glauconite (Greensand Articulated Sandstone)
Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Dinosaur Bone (Fossilized Bone)
Permineralized Dinosaur Bone (Bio-apatite replaced by quartz/silica)
fossil
Fossilized Dinosaur Bone
Permineralized Vertebrate Bone (Apatite/Quartz replacement)
fossil
Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate Matrix with Biogenic Inclusions (CaCO3)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Carved pyrite frog or toad
Pyrite (iron disulfide, FeS₂), likely a carved massive aggregate
mineral
Fossil bone fragment, likely vertebrate limb or rib bone
Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate
fossil
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
CaCO3 (principally Calcite or Aragonite)
sedimentary
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Chert (specifically Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary