Igneous (Anthropogenic)

Basalt

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

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Basalt with Caliche Crust

Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating

River Pebble (Gabbro or Basalt)

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Basalt with Limonite stains

Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)

Pink Granite

Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)

Granite

Felsic Intrusive Igneous Rock (SiO2, Al2O3, K2O, Na2O)

Granite

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

Pink Granite

Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)

Basalt with Plagioclase Feldspar

Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts

Granite Cobble

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Red Granite

Felsic intrusive igneous rock (K-feldspar rich Granite)

Basalt River Stone

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Vesicular Basalt

Extrusive mafic igneous rock (primarily Plagioclase Feldspar and Pyroxene)

Granite

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

Granite

Intrusive Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Druzy Quartz on Vesicular Basalt

Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Granite (Pink/Potassium-rich)

Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Aquamarine

Beryl (Be3Al2Si6O18)

Topaz

Topaz (Al2SiO4(F,OH)2)

Quartz Crystal

Quartz (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Obsidian

Amorphous volcanic glass (primarily SiO2)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcedony (specifically Common Opal or Agate variant)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Amethyst

Silicon Dioxide (SiO2) with trivalent iron (Fe3+) impurities

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Moonstone

Orthoclase feldspar (KAlSi3O8)

Citrine

Citrine (Silicon Dioxide, SiO2)