Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Sandstone
Arenite
sedimentary
Fossiliferous Sandstone / Mudstone
Sedimentary Rock (Clastic with Fossiliferous Inclusions)
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Fossilized bone, likely a large vertebrate limb or rib fragment
Petrified bone; exact taxon indeterminate from the image
fossil
Amber-set ring
Amber (fossilized plant resin; organic mineraloid), set in a metal ring
gemstone
Fossil tooth fragment
Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image
fossil
Polished chalcedony (likely moss/ag ate)
Microcrystalline quartz, SiO₂; probable moss agate or jasper variety
mineral
Tumbled agate (likely moss or plume agate)
Microcrystalline quartz, primarily chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Fossil plant impression slab
Fossilized plant compression/impression; exact taxon indeterminate from the image
fossil
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Enrolled Trilobite Fossil
Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)
fossil
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Travertine (Tufa)
Chemical Sedimentary Rock / Travertine (CaCO3)
sedimentary
Slate
Slate (Foliated metamorphic rock)
metamorphic
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Glauconite (Greensand)
(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂
sedimentary
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Quartz Vein Rock
Silicon dioxide (SiO2) within a host rock matrix
mineral
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral