Sedimentary And Igneous

Iron-rich sandstone or lateritic pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented by iron oxides such as hematite/goethite

Rounded pebble, likely quartz-rich sandstone or weathered granite

Indeterminate lithic clast; possible granite or quartzose sandstone

Calcite

Calcium Carbonate (CaCO3)

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Pyrite

Iron Sulfide (FeS2)

Green Calcite

Calcium Carbonate (CaCO3)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Rock Crystal)

Silicon Dioxide (SiO2)

Hematite

Iron (III) Oxide (Fe2O3)

Quartz (Clear/Crystalline)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Yellow/Citrine Quartz)

Silicon Dioxide (SiO2)

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Quartz Pebble

Silicon Dioxide (SiO2)

Agate (Carnelian Agate with Quartz Matrix)

Silicon Dioxide (SiO2)

Quartz Crystal (Geode Fragment)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Clear Quartz)

Silicon Dioxide (SiO2)

Gold

Native Gold (Au)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (High-grade metamorphic rock)

Tumbled Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)