Fossiliferous Limestone (Coquina)
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Category
Organic (Mineraloid)
Browse organic (mineraloid) specimens identified by the Rock Identifier community.
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Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Black Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Fossilized Tree Resin (Organic Polymer)
gemstone
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3 with organic inclusions)
fossil
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Black Dolomite
Bituminous Dolomite (CaMg(CO3)2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Shale
Laminated Fissile Pelite
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Organic Inclusions
fossil
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Coal
Bituminous Coal (organic sedimentary rock)
sedimentary
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Ambergris
Ambergris (Coprolite-adjacent organic substance)
Organic (Geological interest)
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary