Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Category
Mineral, Sediment
Browse mineral, sediment specimens identified by the Rock Identifier community.
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Rounded iron-rich pebble
Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing
mineral
Amber
Succinite (fossilized resin, C10H16O)
mineral
Rounded yellow-brown pebble
Likely iron-stained sandstone or quartz-rich river cobble
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
Mineral
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Leopard Skin Jasper
Silicon Dioxide (SiO2) with iron and manganese inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Banded Chert (or Banded Jasper)
Silicon Dioxide (SiO2) with Iron Oxide impurities (Hematite/Goethite)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions
sedimentary
Fuchsite
Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of fuchsite)
mineral
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Fossil shark tooth
Likely Otodus megalodon (species identification uncertain from image)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Weathered sandstone or iron-rich mudstone fragment
Clastic sedimentary rock, likely quartz–feldspar sandstone with iron-oxide cement
sedimentary
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Fossilized bivalve shell
Bivalvia indeterminate; likely a fossil cockle or clam shell, aragonite/calcite replaced or preserved
fossil
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Yellow Jasper
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite inclusions
sedimentary
Shale
Shale (Argillaceous sedimentary rock)
sedimentary
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary