Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Category
Browse this appears to be a man made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen. specimens identified by the Rock Identifier community.
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Diamond (in a cluster setting)
Crystallized Carbon (C)
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
Diamond (as set in a gold ring)
Carbon (C)
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Milky Quartz Geode Fragment
Silicon Dioxide (SiO2)
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
Yellow Quartz (Citrine-colored Quartz Pebble)
Silicon Dioxide (SiO2)
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Granite
Granite (Phaneritic igneous rock)
Milky Quartz (with trace inclusions)
Silicon Dioxide (SiO2)
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
Granite
Felsic Plutonic Rock (primarily SiO2)
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
Granodiorite Core
Granodiorite
Diamond (in a jewelry setting)
Cubic Carbon (C)
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Granite Pebble (Weathered)
Phaneritic Felsic Igneous Rock
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)
Pyrite
Iron Sulfide (FeS2)
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Note regarding baguette production (not a rock)
Digital text image - Somali language
Hematite
Hematite (Fe2O3)
Sandstone (Green/Yellow Siltstone variant)
Arenite or Siltstone (primarily SiO2 with mineral staining)
Basalt
Basalt (Mafic volcanic rock)
Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities