Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
Learn about Mineral And Organic Gemstone in the encyclopedia
View all →
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Travertine (Tufa)
Chemical Sedimentary Rock (CaCO3)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Amber
Succinite (fossilized resin)
mineral
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
sedimentary
Chert (Jasper variety)
Chert (SiO2)
sedimentary
Industrial Diamond (Bort or Boart)
Diamond (pure Carbon, C)
mineral
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
sedimentary
Black Limestone with Calcite Veining
Limestone (CaCO3) with Calcite (CaCO3) inclusions
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
metamorphic
Chert (Flint)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Iron-rich variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Chert (often called Flint when dark)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Yellow Quartzite Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Lepidolite in Quartz (Obelisk)
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite)
metamorphic
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
sedimentary