Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil
Chert (Arrowhead Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4·nH2O)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Limonite (Yellow Ochre)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Echinoid Fossil (Fossilized Sea Urchin)
Echinoidea
fossil
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Pearl
Calcium Carbonate (CaCO3)
mineral
Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Orthoceras Fossil
Orthoceras regulare (Extinct Cephalopod)
fossil
Fossil coral (likely solitary rugose coral)
Rugosa; possibly genus Heliophyllum or similar
fossil
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
sedimentary
Kidney Stone
Nephrolith (typically Calcium Oxalate - CaC2O4)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood (Black / Carbonized)
Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)
fossil
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Black Freshwater Pearls
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Belemnite Fossil
Belemnitida (Order within Cephalopoda)
sedimentary
Fossil Shark Tooth
Carcharocles or Lamniformes (order)
fossil
Pyrite-bearing Rock
Iron Sulfide (FeS2)
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Pearl
Calcium Carbonate (CaCO3)
mineral
Pearl (Cultured Freshwater)
Calcium Carbonate (Aragonite) - CaCO3
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Pearl
Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite
mineral
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Spider Conch Shell
Lambis lambis (Calcium Carbonate, CaCO3)
sedimentary