Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Category
Organic Gemstone
Browse organic gemstone specimens identified by the Rock Identifier community.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Amber
Succinates
mineraloid
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Amber
Succinite (Fossilized Tree Resin)
fossil
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
White limestone or chalky carbonate rock
Calcite-rich limestone; possibly chalk (CaCO₃)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Amber
Succinate (Fossilized Resin)
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Amber
Succinates (Organic Fossilized Resin)
mineral
Flint with Fossil Inclusion
Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains
sedimentary
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Likely fossil shell fragment
Indeterminate mollusk fossil; possibly a gastropod or bivalve in limestone
fossil
Amber
Amber (Fossilized Tree Resin)
mineral
Moss Agate
SiO2
mineral
Amber
Fossilized Resin (C10H16O)
mineral
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Fossiliferous Limestone
Calcium carbonate matrix with macrofossils (CaCO3)
fossil
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Amber
Succinite (organic fossilized resin)
mineraloid
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Amber
Succinate (Fossilized Tree Resin)
fossil