Man Made Material (Simulated Mineral)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Sandstone

Sandstone (composed mainly of Quartz, SiO2, and Feldspar)

Sandstone

Arenite (composed primarily of SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Sandstone

Arenite (composed primarily of SiO2)

Diamond (set in Gold)

Diamond (pure carbon, C)

Jasper (Brown Iron-Rich Variety)

Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)

Diorite

Diorite (intermediate plutonic rock)

Iron-rich quartzite or silicified ironstone

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite and possibly hematite

Petrified Wood

Silicified Wood (SiO2)

Quartz Geode/Cluster

Quartz (SiO2)

Chalcedony on Ironstone

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeOOH)

Lemon Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Clastic sedimentary rock (quartz arenite)

Vesicular basalt (weathered scoriaceous basalt)

Basalt; chiefly plagioclase, pyroxene, and commonly olivine (approximately 45–52% SiO₂)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite and Calcite/Aragonite infusions)

Tumbled prehnite (probable)

Prehnite — Ca₂Al(AlSi₃O₁₀)(OH)₂

Polished brown stone, likely smoky quartz or jasper

Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

Amethyst-bearing quartz (rough/tumbled fragment)

Quartz, SiO₂; purple coloration from irradiation and trace iron

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Milky quartz

Quartz (SiO₂), commonly massive or vein quartz

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - Chalcedony with Iron Oxide impurities

Labradorite (Raw)

(Ca,Na)(Al,Si)4O8

Milky Quartz

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon dioxide (SiO2) with trace elements of Titanium, Iron, or Manganese