Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Petrified Wood
Silicified wood (principally SiO2)
fossil
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Glauconite (Greensand)
(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Amber
Succinite (amorphous organic polymer)
mineral
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Amber
Succinite (a fossilized organic resin)
mineral
Chalcopyrite
CuFeS2
mineral
Fossilized bivalve shell
Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.
fossil
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Limonite Geode / Ironstone Concretion
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Amber
Amber (Fossilized Tree Resin)
mineral
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Fossilized bone fragment
Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Vivianite
Vivianite, Fe2+3(PO4)2·8H2O
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Jasper
Microcrystalline Quartz (SiO2)
gemstone
Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Green Sandstone
Glauconitic Sandstone
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil