Sedimentary And Metamorphic

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Gneiss

Banded Gneiss

Quartz pebble

Silicon dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon rank grade)

Anthracite Coal

Carbon (with organic impurities)

Agate

Silicon dioxide (Chalcedony), SiO2

Agate

Silicon dioxide (Chalcedony), SiO2

Agate with Fossil/Inclusion

Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion

Agate

Silicon Dioxide (Chalcedony), SiO2

Mica Schist with Iron Staining

Muscovite/Biotite Schist

Quartz

Quartz (SiO2)

Garnet Schist

Almandine-Garnet Mica Schist

Gneissic Schist

Foliated Metamorphic Rock (Schist/Gneiss transition)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss Pebble

Gneiss

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Quartz

Quartz (SiO2 - Silicon Dioxide)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Quartz

Silicon Dioxide (SiO2)

White Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Yellow / Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or Yellowish)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Star

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)