Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Banded Chert (Ironstone/Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxides

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Carved Merkaba)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Grey River Stone (Quartz-rich Quartzite/Siltstone)

Quartzite / Meta-siltstone (primarily SiO2)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Red Quartzite

Quartzite (SiO2)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (chiefly SiO2)

Marble

Recrystallized Calcite (CaCO3) / Marble

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))

Sandstone

Arenite

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Quartzite (Rounded Pebble)

Quartzite (predominantly SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Chert (Iron-Stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Sandstone

Sandstone (lithified arenite/wacke)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (specifically Tan/Brown Chert)

Chert (SiO2)

Sandstone

Arenite (SiO2 based clastic rock)

Quartz (Milky/Gravel variety)

Silicon Dioxide (SiO2)

Quartzite River Stone

Quartzite (primarily SiO2)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)