Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Category
Organic (Zoogenic)
Browse organic (zoogenic) specimens identified by the Rock Identifier community.
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Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3 with organic inclusions)
fossil
Ambergris
Ambergris (Coprolite-adjacent/Organic secretion)
mineraloid
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Rounded brown sandstone or weathered river cobble
Likely quartz-rich sandstone; exact identification requires a fresh surface and tests
sedimentary
Amber (Copal)
Succiniferous Resin
mineraloid
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Amber
Fossilized Tree Resin
gemstone
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Amber
Succinite (C10H16O)
mineral
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Amber
Succinite (C10H16O)
mineral
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Shale
Fissile Mudstone (Shale)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate
Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber with dark mineral/organic inclusions
Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)
gemstone
Amber
Succinite (Fossilized Tree Resin)
fossil
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous