Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
Learn about Mineral, Jewelry in the encyclopedia
View all →
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Onyx (Black Onyx)
Silicon Dioxide (SiO2)
mineral
Ammonite Fossil
Ammonoidea
fossil
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Green Sheen Obsidian
Volcanic Glass (SiO2 with microscopic inclusions)
igneous
Opal
Hydrated amorphous silica, SiO2·nH2O
gemstone
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst Geode
Quartz (SiO2)
mineral
Fossilized Coral
Rugosa / Tabulata coral fossils replaced by silica (Chalcedony/Quartz)
fossil
Quartz-lined Geode / Chalcedony Nodule
Silicon Dioxide (SiO2)
sedimentary
Agate in Rhyolite
Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix
igneous
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement)
fossil
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Tektite
Natural impact glass
meteorite
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Red Aventurine (Strawberry Quartz / Sunstone Quartz)
Silicon Dioxide with Hematite/Goethite inclusions (SiO2)
mineral
Green Aventurine
Quartz (SiO2) with inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
SiO2 (Silicon Dioxide with iron oxide inclusions)
gemstone
Yellow Aventurine
Silicon Dioxide (SiO2) with inclusions
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rough Diamond (or Herkimer Diamond Quartz)
Diamond (C) or Quartz (SiO2)
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst (Scepter Quartz)
Silicon Dioxide (SiO2) with Iron impurities
mineral
Citrine Quartz
Macrocrystalline Quartz (SiO2)
mineral
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Amazonite
Microcline (KAlSi3O8 with traces of Lead)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Amethyst Crystal Point
SiO2 (Silicon Dioxide with iron impurities)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
gemstone
Amazonite
Microcline (KAlSi3O8) with trace lead/water inclusions
mineral