Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Fossilized Resin) in the encyclopedia
View all →
Fossiliferous Chert (Brachiopod/Bryozoan Fossil)
Microcrystalline quartz (SiO2) with fossil inclusions
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone
Pearl
Calcium carbonate (CaCO3) + organic conchiolin
gemstone
Fossilized Shark Tooth
Elasmobranchii tooth (commonly Otodus or Scapanorhynchus sp.)
fossil
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Pearl (Pendant)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
gemstone
Quartzite with Dendritic Manganese Oxide Inclusions
Metamorphic Quartzite (SiO2 with Mn-oxides)
metamorphic
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Sand Dollar (Fossilized or Calcium Carbonate Skeleton)
Clypeasteroida (Order)
fossil
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Limestone with Fossil Fragments
Bioclastic Limestone (CaCO3)
sedimentary
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite/Hematite and Chert)
sedimentary
Green fluorite (likely polished/cut specimen)
Fluorite, calcium fluoride (CaF₂)
mineral
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
mineral
Fulgurite
Lechatelierite (Silica glass tubes)
mineral
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Fossil coral (likely solitary rugose coral)
Rugosa; possibly genus Heliophyllum or similar
fossil
Pearl necklace
Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)
gemstone
Coral Fossil
Scleractinia (Fossilized Coral)
fossil
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
fossil
Kambaba Jasper
Stromatolite (fossilized algae)
sedimentary
Coprolite
Coprolite (fossilized feces)
fossil
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Spinosaurid Dinosaur Tooth
Spinosaurus aegyptiacus (fossilized)
fossil
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae)
sedimentary
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia
fossil
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Seashell Fossil
Invertebrate Bivalve / Gastropod Fossil (Calcium Carbonate, CaCO3)
fossil
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Fulgurite
Lechatelierite (vitreous silica tube)
mineral
Sandstone Concretion
Sedimentary concretion
Sedimentary
Calamites Fossil in Sandstone
Calamites (Genus) in Lithic Sandstone
sedimentary
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Fossil Coral
Scleractinia (Fossilized Hexacoral)
fossil