Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
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)
sedimentary
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Fossilized Coral
Cnidaria fossil / Calcite-replaced coral
fossil
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Coal
Anthracite / Bituminous Coal
sedimentary
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Limestone with Fossil Fragments
Bioclastic Carbonate Rock (CaCO3)
sedimentary
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Limestone (Weathered/Silicified)
Sedimentary carbonate rock (primarily CaCO3)
sedimentary
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Lapis Lazuli
Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Shale
Fissile Mudstone (Shale)
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Banded Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Chert
Microcrystalline Quartz (SiO2)
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous Sedimentary Rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Note regarding baguette production (not a rock)
Digital text image - Somali language
not a rock