Antropogenic Rock (Man Made)

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Coquina

Biogenic Limestone (CaCO3)

Unakite

Altered Granite (Epidotized Granite)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or quartzite

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Rounded pink granite cobble

Granite, chiefly quartz–alkali feldspar–plagioclase–biotite

Chert (Flint / Jasper variant)

Microcrystalline Quartz (SiO2)

Marble

Metamorphic Limestone (CaCO3)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Pink Granite (Alkali-feldspar Granite)

Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Sandstone

Arenite (composed primarily of SiO2)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Sea glass (likely pale blue glass)

Human-made silicate glass, likely soda-lime glass; not a natural mineral or rock

Polished dark gray stone, likely basalt or fine-grained andesite

Basalt/andesite; primarily plagioclase feldspar, pyroxene, and possibly olivine or magnetite

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Limestone

Sedimentary Rock (Primarily CaCO3)

Sandstone

Arenite (siliciclastic sedimentary rock composed mostly of quartz)

Chert (Flint)

Microcrystalline quartz (SiO2)

Riverstone (Sandstone Pebble)

Arenite (SiO2 with various lithic fragments)

Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)

Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Fine-grained gray stone, possibly slate

Slate (fine-grained metamorphosed mudstone); identification is uncertain from the image

Diamond (in a gold ring)

Diamond (pure carbon, C)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Granodiorite

Granodiorite

Sandstone

Arenite (SiO2 principal)

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Quartzite

Quartzite (Metamorphic Quartz Sandstone)

Quartzite

Metamorphic Quartzite (SiO2)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Banded Chert (River Stone)

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Sandstone

Arenite