Igneous

Bornite

Bornite (Cu5FeS4)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Quartz (possibly Citrine or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Carnelian Agate

Silicon Dioxide (SiO2)

Agate (Nodule/Chert)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - Chalcedony containing Iron Oxide impurities

White Quartz

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3)

Amethyst

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Basalt with Quartz Veins

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions

Basalt with Quartz Vein

Basalt (fine-grained mafic igneous rock) with crystalline Quartz (SiO2)

Granite Cobble

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

Granite Pebble (Salt and Pepper Granite)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)

Granite (weathered)

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

Granite

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

Granite

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

Granite (River-worn Cobble)

Phaneritic Felsic Igneous Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Basalt

Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)

Granite

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

Pink Granite (Alkali Feldspar Granite)

Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)

Pumice

Pumice (a highly vesicular extrusive igneous rock, primarily amorphous silica)

Granite

Granite (Phaneritic Igneous Rock; primarily Quartz, Alkali Feldspar, and Plagioclase)

Basalt

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

Granite

Phaneritic Felsic Igneous Rock (Main minerals: SiO2, KAlSi3O8, NaAlSi3O8)

Granite with Quartz Vein

Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)

Diorite

Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)

Granite

Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)

Pink Granite

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

Pink Granite

Phaneritic Plutonic Igneous Rock (composed of K-feldspar, Quartz, and Mica)

Pink Granite

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

Granite

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

Granite Pebble

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

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Sodalite-rich Syenite (Yooperlite)

Sodalite-rich Syenite (Na8(Al6Si6O24)Cl2 within an igneous matrix)

Granite (Weathered)

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

Basalt (River Cobble)

Mafic Igneous Basalt (composed primarily of Plagioclase feldspar, Pyroxene, and Olivine)

Granite (Weathered/Oxidized)

Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)