Igneous, Sedimentary, And Metamorphic

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milk Quartz / Massive Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear Fragment)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

Gneiss

Gneiss (Metamorphic high-grade)

Dark rounded pebble

Likely basalt or another fine-grained mafic volcanic rock; exact identification is uncertain from the image

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Iron Staining

SiO2 with Fe oxide impurities

Quartz

SiO2 (Silicon Dioxide)

Unidentified small rock fragment

Likely quartz-rich material; exact identification is indeterminate from the image

Pyrite

Iron Disulfide (FeS2)

Quartz Crystal

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold) in Matrix

Iron Disulfide (FeS2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)