Amber with dark mineral/organic inclusions
Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)
gemstone
Category
Organic Gemstone (Not A Rock Or Mineral)
Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Rock Or Mineral) in the encyclopedia
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Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Pearl
Calcium carbonate with conchiolin (CaCO3)
gemstone
Pearl
Calcium carbonate (CaCO3) in the form of aragonite
gemstone
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (C10H16O)
gemstone
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed visually
sedimentary
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Polished operculum (“Shiva eye” shell)
Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Chert (Jasper / Petrified Wood)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Tumbled amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid
gemstone
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Amber (possibly rough amber)
Fossilized tree resin; chemically a complex organic mixture, commonly classified as succinite when Baltic in origin
gemstone
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Amber
Fossilized Tree Resin
gemstone
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Amber
Succinite (Fossilized Resin)
gemstone
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Coral
Corallium rubrum
gemstone
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Amber
Succinite
mineral
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Amber-set ring
Amber (fossilized plant resin; organic mineraloid), set in a metal ring
gemstone
Pearl (in Marcasite Jewelry)
Biogenic Calcium Carbonate (primarily Aragonite, CaCO3)
gemstone
Polished amber (likely copal or amber)
Fossilized tree resin; amber is predominantly polymerized diterpenoid resin, while copal is younger, incompletely polymerized resin
gemstone
Amber
Fossilized tree resin
gemstone