Sedimentary (Man Made Composite)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Sandstone

Arenite (primarily SiO2)

Turquoise (likely stabilized or composite)

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

Sandstone

Arenite (variable SiO2 composition)

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Coal (Bituminous Coal)

Caustobiolith / Sedimentary Rock

Chert / Flint

Silicon Dioxide (SiO2)

Slate

Metamorphic Pelitic Rock

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Chert (Flint)

Silicon Dioxide (SiO2)

Polished brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond

Carbon (C)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Chert (with Quartz)

Microcrystalline Quartz (SiO2)

Chert Arrowhead (Jasper)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Jade bangle

Likely nephrite jade (fibrous amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); possibly jadeite (NaAlSi₂O₆)

Polished/tumbled stone, likely serpentine or agate

Probable serpentine-group mineral (antigorite/lizardite), possibly a green jasper or agate; image is insufficient for certainty

Sandstone

Sedimentary Rock (Quartz arenite)

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

Chalk

Micrite (primarily Calcium Carbonate or CaCO3)

Unakite

Altered Granite (Epidotized Granite)

Moon (lunar surface depiction)

Lunar rock; chiefly anorthosite, basalt, and breccia (plagioclase-rich CaAl2Si2O8)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert

Chert (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Polished chrysocolla-matrix stone (probable)

Chrysocolla, hydrated copper aluminosilicate; likely mixed with quartz, turquoise, or copper minerals

Chert (Flint)

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (SiO2)

Red Sandstone

Quartz Arenite (iron-stained) / SiO2

Sandstone

Arenite

Fossilized gastropod (likely nerite or related sea snail)

Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite

Turquoise ring stone (likely stabilized or dyed turquoise)

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

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Sandstone

Arenite (specifically sublithic or quartz arenite)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)