Basalt with Calcite Veining
Aphanitic Mafic Igneous Rock (Basalt) with CaCO3
igneous
Category
Mineral (Processed Metal)
Browse mineral (processed metal) specimens identified by the Rock Identifier community.
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Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Schist (Mica Schist)
Mica Schist
metamorphic
Fossilized Wood (Petrified Wood)
Agatized wood (primarily SiO2)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Hydroxide inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Tiger's Eye (specifically Blue Tiger's Eye / Falcon's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Mica Schist with Quartz
Mica Schist (principally Muscovite and Biotite with Quartz veins)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica)
metamorphic
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Porphyritic Basalt (with Olivine or Quartz phenocryst)
Porphyritic Basalt (Mafic Extrusive)
igneous
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Goethite
Goethite (α-FeO(OH))
Mineral
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
River Stone (River Pebble)
River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Dragon Vein Agate (Dyed)
SiO2
mineral
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of Crocidolite (Asbestos) replaced by Quartz
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Blue glass-like gemstone specimen (likely dyed or synthetic quartz)
Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image
gemstone
Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Botryoidal chalcedony (likely white quartz/chalcedony)
Microcrystalline quartz, SiO₂; possibly partly altered carbonate or opaline silica
mineral