Bituminous Coal
Coal (Organically derived sedimentary rock)
sedimentary
Category
Organic (Sedimentary Associated)
Browse organic (sedimentary associated) specimens identified by the Rock Identifier community.
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Polished amber-colored translucent stone, likely citrine or yellow chalcedony
Most consistent with quartz (SiO₂), potentially citrine; translucent yellow chalcedony is another possibility
mineral
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian
Chalcedony (SiO2)
mineral
Tumbled brown stone, likely jasper or iron-rich chert
Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert
sedimentary
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species cannot be determined from the image
fossil
Banded Marble (Egg Carving)
Metamorphosed Limestone (predominantly CaCO3)
metamorphic
Fossil shell fragment
Likely a fossilized bivalve or brachiopod valve; exact identification requires the other valve, locality, and matrix
fossil
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Organic Inclusions
fossil
Ironstone / Weathered Hematite
Iron oxide-rich sedimentary rock with Goethite/Hematite
sedimentary
Chert (Jasper variation)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Fossiliferous Kalkstein (Marl/Sandstone)
Fossiliferous calcarenite/siltstone
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium fluoride (CaF2)
mineral
Mica Schist
Mica Schist (Muscovite subclass)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Banded Agate (Banded Chert / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Red Zebra Jasper
Microcrystalline quartz (Chalcedony), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz variety
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
Mineral
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Chert Nodule (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil