Petrified Wood
Silicified Wood (primarily 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.
Petrified Wood
Silicified Wood (primarily SiO2)
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Milky Quartz Geode Fragment
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Sandstone
Arenite
Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
Pyrite-rich Gossan
Iron Sulfide (FeS2) in Ore Matrix
Yellow Quartz (Citrine-colored Quartz Pebble)
Silicon Dioxide (SiO2)
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Granodiorite Core
Granodiorite
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
Granite Pebble
Granite
Granite
Granite (Phaneritic igneous rock)
Basalt
Basalt (Extrusive Igneous Rock)
Pyrite
Iron Sulfide (FeS2)
Milky Quartz (with trace inclusions)
Silicon Dioxide (SiO2)
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Diamond (in a jewelry setting)
Cubic Carbon (C)
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
Granite
Felsic Plutonic Rock (primarily SiO2)
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
Hematite
Hematite (Fe2O3)
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Note regarding baguette production (not a rock)
Digital text image - Somali language
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
N/A (Non-Geological Specimen)
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)