Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Category
Marble
Browse marble specimens identified by the Rock Identifier community.
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate, (Mg,Fe)2SiO4
Mineral
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Kimberlite
Kimberlite
igneous
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Eclogite
Eclogite
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Travertine (Tufa)
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Glauconitic Sandstone (or Greensand)
Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic quartz wacke or arenite
sedimentary
Olivine
Olivine group (Mg, Fe)2SiO4
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Eclogite
Eclogite (comprising Omphacite and Garnet)
metamorphic
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Bivalve Fossil (Internal Mold)
Class Bivalvia (Phylum Mollusca)
sedimentary
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Limestone (specifically Fossiliferous Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Olivine (often within Peridotite)
Magnesium iron silicate, (Mg,Fe)2SiO4
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coquina
Coquina (a type of limestone)
Sedimentary
Rough Diamond
Diamond (pure carbon / C)
mineral
Chert (containing Fossil Inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Atlantic Calico Scallop (Biogenic Aragonite/Calcite)
Argopecten gibbus (Chemical: CaCO3)
mineral
Fossiliferous Limestone (Crinoidal)
Crinoid Limestone (CaCO3 with fossil biological remains)
sedimentary
Yellow Jasper (Mookaite style)
Silicon Dioxide (SiO2) with Goethite/Hematite inclusions
sedimentary
Greywacke
Greywacke (Lithofeldspathic Sandstone)
sedimentary
Olivine-bearing Basalt / Scoria
Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)
igneous
Peridotite (with Olivine and Pyroxene)
Ultramafic Magmatic Rock (Primary minerals: (Mg, Fe)2SiO4 and (Ca, Mg, Fe)2Si2O6)
igneous
Greenstone
Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)
metamorphic
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3) - Bioclastic Limestone
sedimentary
Olivine (Peridotite)
Olivine Group; (Mg, Fe)2SiO4
igneous
Limestone (Flagstone)
Fossiliferous Limestone (CaCO3)
sedimentary
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ambergris
Ambergris (Coprolite-adjacent organic substance)
Organic (Geological interest)
Fossiliferous Limestone (Bivalve Fossil)
Calcium Carbonate (CaCO3) with Bivalvia fossil
sedimentary
Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Fossiliferous Limestone
Bioclastic Limestone (composition: CaCO3)
sedimentary
Coral Fossil (Favosites)
Favosites (Calcite/Calcium Carbonate, CaCO3)
sedimentary