Horse Chestnut (Buckeye seed)
Aesculus hippocastanum seed
Organic (Non-geological)
Category
Organic (Non Geological)
Browse organic (non geological) specimens identified by the Rock Identifier community.
Firewood (Wood Log)
Lignum (Plant tissue composed of cellulose and lignin)
Organic (Non-geological)
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Possible smooth beach pebble (identity uncertain)
Unidentified fine-grained siliceous pebble; possibly chert or quartzite
sedimentary
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
Chert Pebble
Chert (SiO2)
sedimentary
Possible petrified wood or fossilized tooth
Unidentified silicified fossil; exact identification requires close examination
fossil
Pearl
Calcium carbonate (CaCO3) in the form of aragonite
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite / Fossilized Resin (C10H16O)
fossil
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Fossilized bone, likely a large vertebrate limb or rib fragment
Petrified bone; exact taxon indeterminate from the image
fossil
Ironstone Concretion
Ironstone (Siderite/Goethite/Hematite matrix)
sedimentary
Concretion (likely iron-rich sandstone or claystone concretion)
Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing
sedimentary
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Fossil bone or tooth fragment
Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Amber
Succinite (Formula: C10H16O)
Mineraloid
Shungite
Non-crystalline carbon (C)
mineral
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Chert (River Pebble)
Chert (Cryptocrystalline Quartz, SiO₂)
sedimentary
Fossil Coral (Petoskey / Horn Coral Sliced Button)
Scleractinia / Rugosa (Silurian-Devonian Anthozoa)
fossil
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Amber
Succinates (Organic Gemstone)
mineral
Coal
Anthracite / Bituminous Coal
sedimentary