Igneous, Sedimentary, Metamorphic, And Mineral

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Metamorphic Gneiss

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (Metamorphic high-grade)

Quartz

Silicon Dioxide (SiO2)

Green Gneiss

Metamorphic Gneiss

Pyrite

Iron Sulfide (FeS2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Magnetite-rich ironstone (probable magnetite ore)

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

Quartz pebble

Silicon dioxide (SiO2)

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Zoisite with Hornblende

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

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Clear Quartz

Silicon dioxide (SiO2)

Quartz Crystal Point

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (SiO2)

Gneiss (River Cobble)

Gneiss

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Optical Calcite

Calcium Carbonate (CaCO3)

Magnetite (Loadstone candidate)

Iron(II,III) oxide (Fe3O4)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)