Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Category
Organic (Sedimentary Associated)
Browse organic (sedimentary associated) specimens identified by the Rock Identifier community.
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Shale
Laminated Fissile Pelite
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pink Quartz / Rose Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Brown Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shale
Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Limestone Pebble with Crinoid Fossil
Calcium Carbonate (CaCO3) - Fossiliferous Limestone
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Polychrome Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Chert (Common Opal/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Opaline variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary