Fossilized Stingray Mouth Plate
Myliobatidae dental battery
sedimentary
Category
Marble
Browse marble specimens identified by the Rock Identifier community.
Peridotite (with Olivine)
Peridotite (rich in Olivine, (Mg,Fe)2SiO4)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
Chert (containing a small fossil)
Microcrystalline Quartz (SiO2)
sedimentary
Eclogite
Eclogite (Omphacite + Pyrope-Almandine Garnet)
metamorphic
Basalt with Olivine inclusion
Mafic Volcanic Basalt (Fe,Mg)2SiO4
igneous
Kimberlite
Kimberlite
igneous
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Spondylus Oyster Calcification / Fossilized Oyster
Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)
sedimentary
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Granite Thin Section
Granitic rock (Phaneritic texture)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Peridotite
Peridotite (composed largely of Olivine (Mg,Fe)2SiO4 and Pyroxene)
igneous
Aragonite
Aragonite (Carbonate mineral), CaCO3
mineral
Kimberlite
Kimberlite (Porphyritic Peridotite)
Igneous
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Oolite (Ooid)
Oolitic Limestone (chiefly CaCO3)
sedimentary
Brachiopod Fossil
Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality
fossil
Fossiliferous Limestone
Bioclastic Limestone (with Brachiopod and Bivalve molds)
sedimentary
Pearl
Biogenic CaCO3 (Aragonite)
mineral
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Ammonite Fossil
Ammonitida (Extinct subclass of Cephalopoda)
sedimentary
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically Flint or Common Opal variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Chert (Greenish-Grey variety)
Microcrystalline quartz (SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone (Riprap)
Calcium Carbonate (CaCO3)
sedimentary