Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Category
Organic (Sedimentary Associated)
Browse organic (sedimentary associated) specimens identified by the Rock Identifier community.
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Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Green Jasper
Quartz (Silicon Dioxide, SiO2) with iron silicate inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite Bracelet
Calcium Fluoride (CaF2)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Red Jasper and Green Aventurine
Silicon dioxide (SiO2)
mineral
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Menilite Opal (Goddess Stone)
Menilite Opalescent Silex (Amorphous Hydrated Silica)
sedimentary
Amber (Copal)
Fossilized Tree Resin
mineraloid
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Graphite
Graphite (Carbon, C)
Mineral
Red Claystone / Mudstone
Argillaceous sedimentary rock
sedimentary
Dalmatian jasper
Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions
igneous
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Satin Spar (Gypsum)
Gypsum (Satin Spar variety) - CaSO4·2H2O
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Blue Celestine
Celestine (SrSO4)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Native Gold (in earring form)
Gold (Au)
mineral
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Galena
Lead(II) sulfide (PbS)
mineral
Weathered Sedimentary Rock
Sedimentary Rock
Sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony with Quartz
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Chalcedony (Common Opal or Agate)
Silicon Dioxide (SiO2)
mineral
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Limestone (specifically Bituminous or Carbonaceous Limestone)
Calcium Carbonate (CaCO3) with Organic Impurities
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil