Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
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Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Iron-stained quartz-rich cobble, possibly weathered granite or quartz vein rock
Quartz–feldspar aggregate with iron-oxide staining; exact classification is uncertain from the photograph
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
White seed-bead gemstone strand, likely freshwater pearl or shell pearl
Pearl: nacreous calcium carbonate, chiefly aragonite (CaCO₃) in conchiolin; identification uncertain from image
gemstone
Chert (Chert Nodule with Chalky Cortex)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper containing fossilized inclusions
Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions
sedimentary
Graphite
Carbon (C)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Chert / Flint Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Chert (Yellow Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (Organic Mineraloid)
mineral
Amber
Succinate (Fossilized Resin)
mineral
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Amber
Succinite (Fossilized Tree Resin)
gemstone
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Amber
Succinite (approximate formula C10H16O)
mineraloid
Coal
Bituminous Coal / Anthracite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinite (C10H16O)
mineraloid
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary