Industrial Byproduct (Anthropogenic Rock Like Material)

Barite Rose

Barium Sulfate (BaSO4)

Rounded river pebble, likely quartz-rich sandstone or weathered granite

Indeterminate lithic clast; probable quartz–feldspar aggregate with iron-oxide staining

Carborundum

Silicon Carbide (SiC)

Black Tourmaline (Schorl)

Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Polished peridot (olivine) cabochon

Olivine, typically forsterite-rich: (Mg,Fe)₂SiO₄

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Milky Quartz Nodule / Geode precursor

Silicon Dioxide (SiO2)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Drupa or Druzy Quartz on Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Polished ocean jasper (orbicular jasper)

Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Weathered quartz-rich rock, possibly quartzite or chert

Quartz (SiO₂), likely in a quartzite matrix; exact identification is uncertain from the image

Schist

Mica Schist

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Possible basaltic rock or meteorite candidate

Likely vesicular basalt; meteorite identification cannot be confirmed visually

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Schist

Chlorite or Mica Schist

Asphalt Concrete

Bituminous Concrete

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Chert (Chert Nodule)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Likely basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and sometimes olivine

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Peridot in Basalt

Olivine ((Mg, Fe)2SiO4) in Basalt

Sandstone

Arenite (SiO2 with various cementing agents)

Quartz Pebble

Silicon Dioxide (SiO2)

Rough Diamond

Diamond (pure Carbon, C)

Tumbled yellow jasper (probable)

Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Bauxite (Laterite)

Hydrated aluminum oxides (Al2O3·nH2O)

Sandstone

Arenite (typically SiO2 based)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Red Sandstone

Arenite (Ferruginous Sandstone)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Quartz (Gravel Fragment)

Silicon Dioxide (SiO2)

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Rounded yellow-brown cobble

Likely weathered sandstone or quartz-rich conglomeratic clast; exact identification requires a fresh surface and testing

Sandstone (Pebble)

Sandstone (SiO2 with iron oxide impurities)

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)