Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Category
Non Geological
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Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Basalt with Quartz Vein
Aphanitic Mafic Igneous Rock with Quartz (Silica) Intrusion
igneous
Ironstone Concretion (Limonite/Goethite)
Iron-rich sedimentary rock (FeOx)
sedimentary
Chert (within Limestone matrix)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Conglomerate
Clastic Sedimentary Rock
sedimentary
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite and Calcite inclusions
igneous
Pyrite Concretion
Iron Sulfide (FeS2) in Sedimentary Matrix
sedimentary
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Chert
Chert (SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gold in Quartz Matrix
Native Gold (Au) in Quartz (SiO2)
mineral
Septarian Nodule or Mud Crack Fossil
Septarian Nodule (Concretion)
sedimentary
Eclogite
Eclogite (Omphacite + Pyrope)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2
sedimentary
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Diamond in Kimberlite
Kimberlite Matrix with Carbon (Diamond)
igneous
River Pebbles (Tumbled Quartz and Basalt)
Silicon Dioxide (SiO2) for white quartz; Mafic Volcanic Rock for basalt
igneous and sedimentary
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Geode (Unbroken)
Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony
sedimentary
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Limonite (Ironstone Concretion)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Petrified Wood
Silicified Wood (SiO2)
metamorphic