Mosasaur Tooth
Mosasaurus sp.
fossil
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
Learn about Synthetic Polymer (Synthetic Material) in the encyclopedia
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Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Vuggy Limestone
Calcium Carbonate (CaCO3) with Quartz/Calcite inclusions
sedimentary
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Obsidian
Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)
igneous
Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint when in chalk or limestone)
Silicon Dioxide (SiO₂)
sedimentary
Chert (variably Oolitic or Fossiliferous)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Amethyst quartz cluster
Quartz, SiO₂; purple coloration from iron impurities and irradiation
mineral
Sandstone (with vugs)
Arenite / Sedimentary Sandstone
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz-rich pebble, possibly chert or silicified limestone
Microcrystalline quartz (SiO₂), possibly chalcedony; exact identification is uncertain from the photograph
sedimentary
Tumbled carnelian
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite
Quartz (SiO₂), potentially with feldspar and iron-oxide staining
mineral
Weathered granite pebble
Granite, chiefly quartz (SiO₂), feldspar, and mica/amphibole
igneous
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Diamond
Carbon (C)
gemstone
Quartz Veined Basalt
Mafic Igneous Rock with Quartz (SiO2) intrusion
igneous