Sedimentary (Chemically Precipitated) Or Metamorphic

Quartzite

Quartzite (SiO2)

Chert pebble

Microcrystalline silica (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (SiO2)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert (Black Chert)

Microcrystalline Silica (SiO2)

Banded Onyx (Cave Calcite)

Calcite (CaCO3), often called Mexican Onyx or Travertine

Banded Chert

Microcrystalline Quartz (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz-rich rock fragment

Milky quartz, primarily silicon dioxide (SiO₂), possibly quartzite or a feldspar-bearing vein rock

Quartz

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Jasper

Microcrystalline quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Banded Agate (Lace Agate)

Agate (Variety of Cryptocrystalline Quartz), SiO2

Soil Clod / Caliche Nodules

Pedogenic Calcrete / Clay aggregate

Blue Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)