Sedimentary Like (Industrial Composite)

Muscovite Schist

Metamorphic rock primarily composed of quartz and muscovite mica

Quartz Sand

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Carved Gemstone Mushroom

Quartz / Feldspar composite (Carved lapidary art)

Limestone

Calcium Carbonate (CaCO3)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Polished malachite

Malachite (Cu₂CO₃(OH)₂), a hydrated copper carbonate hydroxide

Turquoise cabochon ring

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Unakite

Altered Granite (Epidotized Granite)

Polished malachite slab

Malachite, Cu₂CO₃(OH)₂; likely polished and possibly resin-stabilized

Shale

Laminated Mudstone (Shale)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Iron-stained)

Arenite (primarily SiO2 with Fe2O3 staining)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Sandstone Pebble

Arenite (SiO2 based)

Blue-green faceted gemstone, likely turquoise or treated turquoise

Turquoise: hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification is uncertain from the image

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Fuchsite or Green Mica Schist

Muscovite variant (KAl2(AlSi3O10)(OH)2 with Cr)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Barite Rose

Barium Sulfate (BaSO4)

Kaolinite (Kaolin)

Kaolinite (Al2Si2O5(OH)4)

Chert (Iron-Stained)

Chert (Silicon Dioxide, SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Tumbled turquoise cabochon

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly stabilized or dyed material

Limestone

Sedimentary Rock (Primarily CaCO3)

Blue Kyanite in Schist

Al2SiO5 in Mica Schist

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide impurities)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Greenish Metamorphic Rock (likely containing epidote or chlorite)

Metamorphic rock, possibly epidosite or greenstone

Basalt

Basalt

Bauxite (Laterite)

Hydrated aluminum oxides (Al2O3·nH2O)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Sandstone

Arenite (SiO2 based)

Fossilized bone fragment

Mineral-replaced vertebrate bone, commonly apatite [Ca₅(PO₄)₃(F,OH,Cl)]

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Sandstone (Water-worn Cobble)

Arenite (SiO2 based)

Turquoise cabochon jewelry

Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Fossiliferous Limestone with Crinoid Stem fragment

Calcite (CaCO3) containing Crinoidea fossils

Fossil crocodilian skull and jaws

Crocodyliform fossil; exact genus and species cannot be determined from the image