Petrified Wood
Silicified Wood (SiO2)
mineral
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amber
Succinates (Organic Gemstone)
mineral
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Ambergris
Ambrein (C30H52O)
mineraloid / organic geological substance
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary
Ironstone Concretion
Ironstone (primarily Siderite or Limonite)
sedimentary
Black Shale
Argillaceous Chert/Shale
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Geode (Unopened)
SiO2 (Quartz-filled Sedimentary Nodule)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Gray River Pebble (likely Limestone or Siltstone)
Sedimentary Rock (Calcium Carbonate or Siliciclastic)
sedimentary
Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fancy Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil