Agate (Moss or Dendritic Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Category
Mineral, Organic Gemstone
Browse mineral, organic gemstone specimens identified by the Rock Identifier community.
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Amber / Copal
Organic resin, C10H16O
mineral
Sandstone
Arenite
sedimentary
Limestone Concretion (Botryoidal/Calcareous Nodules)
Calcium Carbonate Concretion (CaCO3)
sedimentary
Yellow Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions
sedimentary
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Dendritic jasper/chalcedony
Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites
mineral
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Amber
Succinite (approximate formula C10H16O)
mineraloid
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossilized Shell Fragment / Mother of Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Chert (Nodule)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Shale
Laminated Fissile Pelite
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Graphite
Carbon (C)
mineral
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Mammoth Molar Fossil
Mammuthus primigenius (Tooth fragment)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Tumbled amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid
gemstone
Amber (likely beach-worn amber or resinous material)
Fossilized plant resin; predominantly organic terpenoid polymers (succinite)
gemstone
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Red heart-shaped glass bead in a wire-wrapped jewelry charm
Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen
gemstone
Fossil Shark Tooth
Selachii fossil
fossil
Mammoth Tooth
Mammuthus tooth
fossil
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Fairy Stone (Menilite Concretion)
Carbonate-rich concretion (often Siderite or Calcite in Clay)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary