Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Category
Not A Geological Specimen
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Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate (Agatized Geode Slice)
Silicon Dioxide (SiO₂)
mineral
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
Olivine (Peridotite)
Magnesium iron silicate ((Mg, Fe)2SiO4)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Septarian Nodule or Mud Crack Fossil
Septarian Nodule (Concretion)
sedimentary
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid
Petrified Wood
Silicified Wood (SiO2)
mineral
Pyrite Concretion
Iron Sulfide (FeS2) in Sedimentary Matrix
sedimentary
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt with Fusion Crust (Meteorite-like appearance)
Vesicular Basalt
igneous
Amethyst Geode
Silicon Dioxide with trace inclusions of Iron (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Tektite (Indochinite)
Impact Glass (SiO2 + Al2O3)
mineraloid
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)