Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Category
Organic Gemstone
Browse organic gemstone specimens identified by the Rock Identifier community.
Learn about Organic Gemstone in the encyclopedia
View all →
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Glauconitic Sanstone (Glauconite)
Glauconite ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Limestone (with possible Crinoid or Fossil Impression)
Calcium Carbonate (CaCO3) / Calcite
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Chert (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Limestone Pebble
Sedimentary carbonate rock (CaCO3)
sedimentary
Amber
Succinite (fossilized tree resin)
mineral
Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Fossilized Shark Tooth
Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))
fossil
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Veins
Microcrystalline silica (SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary