Igneous, Sedimentary, Metamorphic, Mineral

Clear Quartz

Silicon Dioxide (SiO2)

Magnetite or Magnetic Iron Ore

Magnetite (Fe3O4)

Gneiss (River Cobble)

Gneiss

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Zoisite with Hornblende

Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Hematite

Iron Oxide (Fe2O3)

Garnet

Almandine (Fe3Al2(SiO4)3)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (specifically Clear or Rose Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

White Calcite

Calcium Carbonate (CaCO3)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Quartz Pebble

Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (Metamorphic rock)

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix

Mica / Muscovite or Biotite

Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)

Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Oxide

SiO2

Gneiss

Metamorphic Gneiss

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (likely Rose or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Quartzite / Iron-stained Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)