Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Limestone (Weathered)
Sedimentary carbonate rock, primarily calcium carbonate (CaCO3)
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
fossil
Red Jasper / Chert
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Likely tumbled jasper or chert specimens
Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph
sedimentary
Amber
Fossilized Resin (C10H16O)
mineral
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
mineral
Fossiliferous Limestone containing a Brachiopod or Mollusk Impression
Biogenic Sedimentary Rock / Fossiliferous Limestone
sedimentary
N/A - Non-Geological Item
not a rock/mineral
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinates (Fossilized Resin)
mineral
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Banded Chert (Ironstone/Jasper)
Cryptocrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Amber and Citrine Quartz
Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)
mineral
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Amber
Succinite (fossilized resin, C10H16O)
mineral
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (fragment)
Elasmobranchii (Class) fossil
fossil
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Amber
Succinates (Fossilized Tree Resin)
fossil
Chert Pebble (Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Angel Skin Coral
Corallium rubrum / Corallium spp. (Calcium Carbonate, CaCO3)
gemstone
Chert (specifically Tan/Yellow Chert)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Petrified Wood
Silicified wood (Quartz / Chalcedonized wood, SiO2)
sedimentary
Ferruginous Sandstone with Concretion
Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary