Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Category
Industrial Byproduct
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Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Basalt (River Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granodiorite
Granodiorite (Na,Ca)(Al,Si)4O8
igneous
Vesicular Basalt
Basalt (with vesicular texture)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Pumice and Scoria
Vesicular Volcanic Ejecta (Rhyolite/Andesite/Basalt)
igneous
Basalt
Basalt
igneous
Basalt (Vesicular/Scoria)
Vesicular Basalt
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Pink Granite
Granite (Felsic plutonic rock)
igneous
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (Vesicular)
Basalt
igneous
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Iron-rich meteorite candidate
Undetermined; possible stony-iron or iron meteorite, commonly kamacite–taenite alloy
meteorite
Opalite Egg
Synthetic Glass (Simulated Opal)
mineral
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Polished black stone, possibly obsidian
Volcanic glass (obsidian), chiefly amorphous SiO₂
igneous
Likely sandstone or weathered quartz-rich rock fragment
Quartz-rich sandstone; exact identification is uncertain from the photograph
sedimentary
Iron meteorite fragment (likely meteorite slice)
Fe–Ni metallic meteorite, possibly an octahedrite; exact classification requires laboratory analysis
meteorite
Quartzite
Quartzite (SiO2)
metamorphic
Dark basaltic rock, possibly vesicular basalt
Basalt; chiefly plagioclase feldspar, clinopyroxene, and commonly olivine or iron-titanium oxides
igneous
Ironstone
Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)
sedimentary
Ferruginous Sandstone (Ironstone)
Iron-rich Arenite
sedimentary
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral