Igneous, Sedimentary, And Metamorphic

Green Calcite

Calcium Carbonate (CaCO3)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz or Moonstone

Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartz pebble

Silicon dioxide (SiO2)

Gneiss

Gneiss

Gneiss

Gneiss (High-Grade Metamorphic Rock)

Epidote

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))

Granite Gneiss

Granitoid Gneiss

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Green Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Granitic Gneiss)

Gneiss

Gneiss

Gneiss

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Calcite

Calcite (CaCO3)

Garnet Amphibolite (or Garnet Gneiss)

Garnet amphibolite / Garnet-bearing metamorphic rock

Biotite Schist

Metamorphic Rock (Schist)

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Greenschist

Chlorite Schist

Magnetite

Magnetite (Fe3O4)

Gneiss

Gneiss

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Quartz (SiO2)