Yellow Aventurine
Silicon Dioxide (Quartz with inclusions), SiO2
mineral
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Banded Calcite (Onyx Marble / Green Onyx)
Travertine / Banded Calcite (CaCO3)
sedimentary
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Otodus Shark Tooth
Otodus obliquus
fossil
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Tumbled Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Polished yellow jasper cabochon
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
metamorphic
Chert with Chalcedony/Quartz Vug
Cryptocrystalline Silica (SiO2)
sedimentary
Granite Thin Section
Granitic rock (Phaneritic texture)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Native Copper
Copper (Cu)
mineral
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
sedimentary
Tumbled yellow quartz (likely citrine)
Quartz, silicon dioxide (SiO₂), iron-colored variety
mineral
Dyed Agate Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial pigment
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with orbicular mineral inclusions; mainly SiO₂
mineral
Polished banded calcite (onyx marble)
Calcite, CaCO₃; commonly marketed as “honey onyx” or “Mexican onyx”
mineral
Gold
Aurum (Au)
Mineral (Metal)
Iron Meteorite
Meteoritic Iron (Fe-Ni alloy)
meteorite
Gold
Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Likely native copper nugget
Native copper (Cu)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Concretion
Calcareous or ferruginous concretion
sedimentary
Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
gemstone
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Silver (Native Element / Alloy)
Silver (Ag)
mineral
Diamond
C (Carbon)
mineral
Banded Onyx (Mexican Onyx / Travertine)
Calcite (CaCO3) - Banded Travertine
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)