Sedimentary And Igneous

Quartz Pebble

Silicon Dioxide (SiO2)

Bumblebee Jasper

Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)

Gneiss (River Cobble)

Metamorphic Gneiss

Dragon Egg Agate

Agate (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Quartz

Silicon Dioxide (SiO2)

Quartz (Yellow / Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gneiss

Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Amphibolite / Biotite Schist

Amphibolite (rich in Hornblende and Plagioclase feldspar)

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Banded Gneiss

Banded Gneiss (High-grade Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Fuchsite Schist with Quartz

Chromian Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2] Schist

Gneiss

Gneiss

Clear Quartz

Silicon Dioxide (SiO2)

Biotite Schist

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

Pyrite

Iron Sulfide (FeS2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Blue Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Gneiss (Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Mica)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz (Milky or Yellowish)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Fluorite

Calcium Fluoride (CaF2)

Gneiss

Gneiss

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Star

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)