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
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Chert Pebble
Chert (SiO2)
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
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
Ironstone Concretion
Ironstone (Siderite/Goethite/Hematite matrix)
sedimentary
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Fossil Coral (Petoskey / Horn Coral Sliced Button)
Scleractinia / Rugosa (Silurian-Devonian Anthozoa)
fossil
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Amber
Succinite (Formula: C10H16O)
Mineraloid
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Coal
Anthracite / Bituminous Coal
sedimentary
Graphite
Graphite (Carbon, C)
Mineral
Chert (River Pebble)
Chert (Cryptocrystalline Quartz, SiO₂)
sedimentary
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Anthracite Coal
Anthracite (Metamorphic/High-grade Sedimentary Coal)
sedimentary
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Amber
Succinates (Organic Gemstone)
mineral