Igneous, Metamorphic, Sedimentary

Gneiss

Foliated Metamorphic Rock

Gneiss

Gneiss (Metamorphic rock)

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Foliated Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Foliated Metamorphic Gneiss

Gneiss

Gneissic Metamorphic Rock

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Pyrite (Iron Disulfide), FeS2

Quartz

Quartz (SiO₂ - Silicon Dioxide)

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Fossiliferous limestone (likely crinoidal or shell limestone)

Calcite-rich limestone; predominantly CaCO₃, with visible fossil fragments

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Green Schist

Greenschist (Chlorite Schist)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Green Mica Schist

Mica Schist (Fuchsite or Chlorite variety)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss

Biotite Schist

Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)

Gneiss

Gneiss

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)