Sedimentary Or Metamorphic

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Kyanite

Kyanite (Al2SiO5)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Banded gneiss fragment

Gneiss, likely quartz–feldspar–mica gneiss

Banded gneiss

Gneiss, likely biotite–quartz–feldspar gneiss

Slate

Slate; predominantly fine-grained phyllosilicates (muscovite/illite, chlorite) with quartz and feldspar

Gneiss (Augen Gneiss)

Augen Gneiss

Garnet-Bearing Schist

Almandine Garnet Schist

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Pyrite

Iron Pyrite (FeS2)

Biotite Schist

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

Schist

Schist (Foliated Metamorphic Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Black Slate

Slate (Metamorphic Rock)

Green Aventurine

Aventurine Quartz (SiO2 with fuchsite inclusions)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Tumbled Rose Quartz

Quartz (Silicon Dioxide, SiO2 with trace amounts of titanium, iron, or manganese)

Quartz

Silicon Dioxide (SiO2)

Pink Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)