Igneous, Sedimentary, Metamorphic

Magnetite / Iron Ore (likely Hematite-Magnetite mix)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartz Sand

Silicon Dioxide (SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Pyrite

Pyrite (Iron Disulfide), FeS2

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Biotite Schist

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

Gneiss

Gneiss (Metamorphic high-grade)

Gneiss

Foliated Metamorphic Rock

Gneiss

Gneiss (Metamorphic rock)

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Green Schist

Greenschist (Chlorite Schist)

Pyrite

Iron Disulfide (FeS2)

Foliated Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Foliated Metamorphic Gneiss

Gneiss

Gneissic Metamorphic Rock

Gneiss

Gneiss (High-grade metamorphic rock)

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))