Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert Pebble Map

Microcrystalline Quartz (SiO2)

Quartz (Iron-stained or Milky)

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (with ripple marks)

Arenite / Quartz Sandstone

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Jasper (specifically Bloodstone/Heliotrope or Dark Green Jasper)

Cryptocrystalline Quartz (SiO2) with inclusions

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Amethyst on Agate/Basalt Matrix

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite Sand (Decomposed Granite)

Grus / Quartz-Feldspar Detritus

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Cryptocrystalline quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Banded Quartz

Silicon Dioxide (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Sandstone

Arenite (SiO2 based)

Chert (Siliceous Mudstone variant)

Microcrystalline quartz (SiO2)

Chert (and Flint variant)

Microcrystalline Quartz (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Clear Quartz

Silicon Dioxide (SiO2)

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)