Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Magnetite
Magnetite (Fe3O4)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Fossil Shark Tooth
Odontaspididae (Sand Tiger Shark family)
fossil
Granite
Intrusive igneous felsic rock
igneous
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Vesicular Basalt
Basalt with vesicular texture
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Agatized Dinosaur Bone
Permineralized Dinosaur Bone (Silicified/Agatized Bone)
fossil
Mica Schist
Mica Schist (varies based on mineral makeup, often Biotite/Muscovite schist)
metamorphic
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Smoky Quartz with Axinite
SiO2 (Quartz) with (Ca,Mn,Fe,Mg)3Al2BSi4O15(OH) (Axinite)
mineral
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Carnelian
Carnelian Agate (SiO2)
mineral
Common Opal (Potch)
Opal (Hydrated silica, SiO2·nH2O)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Geode
Crystalline Quartz in Sedimentary Matrix (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Botryoidal Chalcedony (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Extrusive Volcanic Glass (primarily SiO2)
igneous
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Arenite
Sedimentary
Limonite (Oxidized Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral