Lava Rock Substrate
Scoria (Basaltic Rock)
igneous
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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Fossilized Brachiopod
Brachiopoda (likely Order Spiriferida or Productida)
fossil
Weathered flint or chert fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineraloid
Chert (Jasper / Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Shark Tooth Fossil
Selachii fossil
fossil
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossilized oyster or other bivalve shell
Calcitic bioclast, commonly Ostrea spp. or Exogyra spp.
fossil
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Brachiopod Fossil
Phylum Brachiopoda (poss. Order Spiriferida or Rhynchonellida)
fossil
Amber
Succinite (fossilized resin)
mineral
Amber
Succinite (fossilized resin)
Organic Mineraloid
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Fossilized Shark Tooth (Fragment) in Matrix
Elasmobranchii (subclass)
fossil
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Brachiopod Fossil
Phylum Brachiopoda (replaced by Calcite or Silica)
sedimentary
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite (organic fossilized resin)
mineraloid
Amber
Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)
mineral
Sand Dollar Fossil (Echinoidea)
Class Echinoidea (likely order Clypeasteroida), CaCO3 (Calcite)
sedimentary
Sandstone with Trace Fossils
Arenite with Ichnofossils
sedimentary
Fossiliferous limestone, possibly containing a brachiopod or bivalve fossil
Calcite-rich limestone (CaCO₃), with an apparent shell impression or shell fragment
fossil
Amber
Succinite (Formula: C10H16O)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coprolite
Coprolite (fossilized feces)
sedimentary
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Aragonite (Onyx Marble)
Aragonite / Calcium Carbonate (CaCO3)
mineral
Burmese Amber (Burmite)
Burmite (C10H16O)
mineraloid
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary