Chert (Flint nodule)
Chert (SiO2)
sedimentary
Category
Organic (Sedimentary Associated)
Browse organic (sedimentary associated) specimens identified by the Rock Identifier community.
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Slate
Slate (Foliated metamorphic rock)
metamorphic
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper / Agate (Chalcedony)
Silicon dioxide (SiO2)
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Galena
Lead sulfide (PbS)
mineral
Green Jasper / Plasma
Microcrystalline Quartz (Chalcedony), SiO2 with inclusions
gemstone
Sulfur on Aragonite
Sulfur (S) on Aragonite (CaCO3)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Agate (Polychrome Jasper / Mookaite variety)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Tumbled Agate Pebble
Silicon Dioxide (SiO2)
sedimentary
Celestine (Celestite)
Celestine (Strontium Sulfate, SrSO4)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Muscovite Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2 matrix)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Goethite
sedimentary
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
sedimentary (mineraloid/microcrystalline quartz)
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Native Gold
Native Gold (Au)
mineral
Blue Lace Agate
Silicon Dioxide (SiO2) - Chalcedony / Quartz
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Mica Schist
Schist (Muscovite/Biotite Schist)
metamorphic
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Chert (Flint)
Chert (Cryptocrystalline silicon dioxide, SiO2)
sedimentary
Amber
Succinicum (C10H16O)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Bloodstone
Chalcedony quartz variety Heliotrope (SiO2)
gemstone