Desert rose
Gypsum rosette (CaSO₄·2H₂O), sometimes barite (BaSO₄)
mineral
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
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Fossiliferous limestone, possibly coral or stromatoporoid fossil
Calcitic limestone; predominantly CaCO₃, with fossilized colonial-organism structures
fossil
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite
Organic (Mineraloid)
Pyrite
Iron Sulfide (FeS2)
mineral
Possible fossilized tooth fragment
Indeterminate fossil enamel/dentine; possibly shark tooth fragment
fossil
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous limestone pebble (probable coral or shell fossil)
Calcite (CaCO₃), commonly biogenic limestone; exact fossil taxon indeterminate from the image
fossil
Brachiopod Fossil
Phylum Brachiopoda (order potentially Spiriferida)
fossil
Fossilized coral (likely colonial coral)
Fossil scleractinian coral; possibly *Thamnasteria* or a related coral
fossil
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinicum (C10H16O)
mineral
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Fossilized tooth, likely a shark tooth
Fossil vertebrate tooth; exact taxon uncertain, possibly Otodus/Carcharodon-type
fossil
Black Pearl (Tahitian Type)
Aragonite / Conchiolin composite (CaCO3)
mineraloid
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Fossiliferous limestone pebble
Calcite-rich limestone containing possible brachiopod or coral fossil impressions
fossil
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pink opal and dendritic agate bead bracelet/necklace
Common opal (hydrated amorphous silica, SiO₂·nH₂O) with dendritic agate/chalcedony (microcrystalline quartz, SiO₂)
gemstone
Petrified Wood with Lichen
Silicified Wood (SiO2) colonized by crustose lichens
fossil
Fossilized shark tooth
Fossil shark tooth; exact shark species cannot be determined from this image
fossil
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint Nodule
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone (Crinoidal Limestone)
Bioclastic grainstone (CaCO3)
sedimentary
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Fossilized Coral in Chert
Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)
fossil
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Chert or Limestone)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineraloid
Fossil Shark Tooth
Carcharhinidae or Lamniformes sp. (possibly Carcharodon or Otodus genus)
fossil
Kidney Stone (Renal Calculus)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
mineral
Likely weathered petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂) replacing wood tissue
fossil
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
Tumbled fossiliferous limestone
Bioclastic limestone, chiefly calcite (CaCO₃), with fossil shell fragments
fossil
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Zebra Rock (Zebra Stone / Ribbon Stone)
Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)
sedimentary
Fossilized wood (petrified wood)
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary