Fossilized Shark Tooth
Otodus obliquus (Mackerel Shark)
sedimentary
Category
Limestone
Browse limestone specimens identified by the Rock Identifier community.
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Orange Calcite with Siderite/Iron Oxide Coating
Calcium Carbonate (CaCO3)
mineral
Crinoid Stem Fragment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Chert (with Limestone matrix)
Microcrystalline Quartz (SiO2)
sedimentary
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often found within Limestone)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Chert (varieties: Flint, Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Fossiliferous Limestone (Murchisonia/Gastropod Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Crinoid Stem Columnal
Phylum Echinodermata; Class Crinoidea (CaCO3)
sedimentary
Sulfur-bearing Limestone (Solfatara Specimen)
Sulfur-rich Bio-limestone (Calcium Carbonate with Native Sulfur, S8)
sedimentary
Black Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone with Lichen
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) Rich Bio-sedimentary Rock
sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (and Limestone)
Silicon Dioxide (SiO2)
sedimentary
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Oolitic Limestone
Oolite (Sedimentary Calcium Carbonate)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Chert (and Limestone)
Silicon Dioxide (SiO2)
sedimentary
Oolitic Limestone
Oolite (Sedimentary Calcium Carbonate)
sedimentary
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Chert (Flint) Nodule
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Brachiopod Fossil
Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality
fossil
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary