Igneous

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

Granite

Plutonic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Granite

Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Basalt with Quartz Veining

Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins

Red Granite

Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Pumice

Pumice (Highly vesicular felsic extrusive igneous rock; primarily SiO2)

Quartz Veined Diorite or Basalt

Crystalline Silicon Dioxide (Quartz) in Mafic Igneous Host (Basalt/Diorite)

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Vesicular Basalt

Extrusive Mafic Igneous Rock (composed of Plagioclase feldspar, Pyroxene, and Olivine)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)

Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Alkali Feldspar)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Granite

Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)

Granite

Phaneritic Intrusive Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Diorite (Salt and Pepper Rock)

Phaneritic plutonic igneous rock (sodium-rich plagioclase feldspar and hornblende)

Granite

Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Greenschist

Greenschist (Chlorite-Albite-Epidote Schist)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Milky Quartz

Silicon Dioxide (SiO2)

White Topaz

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2]

Blue Lace Agate (Polished Point)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Sodalite

Na8(Al6Si6O24)Cl2

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss (Augen Gneiss)

Augen Gneiss

Quartz Pebble

Crystalline Silica (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Red Garnet

Pyrope or Almandine (X3Y2(SiO4)3)

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Citrine Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities