Galena
Lead(II) sulfide (PbS)
mineral
Category
Mineral (Biogenic Replacement)
Browse mineral (biogenic replacement) specimens identified by the Rock Identifier community.
Polished amber-colored stone, possibly chert or jasper
Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper
mineral
Fossilized bone, likely a tooth or jaw fragment
Mineralized vertebrate bone; taxonomic identification requires clearer diagnostic anatomy
fossil
Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz/chalcedony; mainly SiO₂ with iron-oxide inclusions
mineral
Polished/tumbled brecciated jasper (likely rainforest or ocean jasper)
Microcrystalline quartz (SiO₂), commonly mixed with chalcedony, iron oxides, and other silicates
mineral
Fossil Shell
Phylum Mollusca (Bivalvia or Brachiopoda)
fossil
Fossil shark teeth
Likely fossilized shark teeth, possibly Carcharhiniformes or related sharks; exact species cannot be determined from the photo.
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Ammonite fossil
Fossilized ammonoid cephalopod; likely an ammonite such as *Ammolytoceras* or a related Jurassic–Cretaceous genus
fossil
Ammonite fossil
Ammonoidea; likely a Jurassic or Cretaceous ammonite
fossil
Jasper
Silicon Dioxide (SiO2)
sedimentary
Fossilized bone fragment
Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate
fossil
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Tumbled jasper (likely ocean or brecciated jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Fossilized gastropod (snail)
Silicified or calcite-replaced gastropod fossil; exact genus indeterminate
fossil
Polished fossilized ammonite or nautiloid shell
Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony
fossil
Likely galena-bearing ore
Galena (lead sulfide, PbS), possibly mixed with quartz or other sulfides
mineral
Metallic sulfide-bearing rock, possibly galena-rich ore
Likely galena (PbS) with iron sulfides and quartz/rock matrix; exact identification requires testing
mineral
Botryoidal Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone
sedimentary
Fossil scallop shell
Fossilized bivalve mollusk; likely Pectinidae or a related pectinid
fossil
Polished brecciated jasper
Silicified microcrystalline quartz (chalcedony), commonly called jasper
sedimentary
Fossilized bivalve shell
Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.
fossil
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (Pendant)
Quartz Pseudomorph (SiO2) after Crocidolite
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn+2,Fe+2,Mg,Ca)SiO3
mineral
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Fossil Snail
Gastropoda fossil
fossil
Seashell Fossil
Gastropoda fossil
fossil
Coprolite
Fossilized feces (various taxa)
sedimentary
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert or jasper (iron-stained, brecciated variety)
Microcrystalline quartz (SiO₂), commonly termed jasper when strongly colored by iron oxides
sedimentary
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Galena (lead sulfide)
Galena, PbS
mineral
Small gray metallic-looking rock
Indeterminate; possibly galena-bearing ore or metallic sulfide
mineral