Anthropogenic (Man Made Product Subject To Geological Processes)

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Petrified Wood

Silicified Wood (primarily SiO2)

Dyed turquoise-colored lava stone beads

Vesicular basalt (scoria), commonly sold as dyed lava rock

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Granite

Granite (a plutonic rock)

Granitic Gneiss

Gneiss (Polymetamorphic Granitic Gneiss)

Goethite

Goethite (α-FeO(OH))

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Stainless Steel Spoon

Iron-Chromium Alloy (Fe + Cr + Ni)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Slag

Ferrous Slag (Siliceous industrial waste)

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Quartz

Silicon dioxide (SiO₂)

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Sea Glass (Teal/Turquoise)

Amorphous Silica (SiO2) with trace metal oxides

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Granite Cobble/Pebble

Granite

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Granite (weathered pebble)

Granite (plutonic igneous rock)

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Concrete aggregate surface

Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

Quartz

Quartz (SiO2)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Polymictic breccia, possibly volcanic breccia

Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals

Crushed Limestone

Calcium Carbonate (CaCO3)

Quartz (Pebble)

Quartz (SiO₂)

Sulfur on Aragonite

Sulfur (S) and Aragonite (CaCO3)