Quartz on Basalt
Silicon Dioxide (SiO2) on Mafic Igneous Rock
Mineral on Igneous Rock
Category
Non Geological
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Quartz Geode
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Banded Gneiss Pebble
Banded Gneiss
metamorphic
Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate Matrix with Biogenic Inclusions (CaCO3)
fossil
Petrified Wood
Silicon Dioxide Fossilized Wood (SiO2)
fossil
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
igneous
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
Limonite Geode / Ironstone Concretion
Hydrated iron oxide-hydroxide (FeO(OH)·n H2O)
sedimentary
Ironstone / Weathered Hematite
Iron oxide-rich sedimentary rock with Goethite/Hematite
sedimentary
Limonite/Goethite Iron Concretion
Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)
mineral
Green Jasper / Metavesuvianite-bearing rock
Silica-rich microcrystalline quartz aggregate / Green Jasper
igneous
Generic Pebble / Small Rock Fragment
Lithic fragment / Weathered rock particle
sedimentary
Komatiite Drill Core
Ultramafic Volcanic Rock (Spinifex Texture)
igneous
Graphic Granite
Graphic Granite (Granitic Pegmatite)
igneous
Moqui Marble (Shaman Stone)
Ironstone Concretion (Iron oxide Fe2O3 and FeO(OH))
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Kambaba Jasper
Stromatolite (fossilized algae)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz with Metallic Inclusion
Silicon Dioxide (SiO2) with associated metallic sulfide or oxide
mineral
Sandstone Geode
Sedimentary Geode (Silica/Calcite composition)
sedimentary
Moqui Marble (Concretion)
Iron Oxide Concretion
sedimentary
Coral Fossil Rock (Syringopora)
Syringopora (Organ-pipe Coral fossil in Limestone matrix)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Geode Nodules / Agate Chert
Silicon Dioxide (SiO2)
sedimentary
Septarian Nodule (Septarian Stone)
Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)
sedimentary
Peanut Wood
Silicified (Petrified) Wood - SiO2 (Silicon Dioxide)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Petrified Wood / Red Jasper
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Fossilized Gastropod in Limestone
Gastropoda (Class) in Fossiliferous Limestone
sedimentary
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral