Mineral On Igneous Rock

Obsidian (Arrowhead Lithic Tool)

Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Basalt

Vesicular Basalt (Mafic volcanic rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic Glass (with inclusions of Magnetite or Hematite)

Granite

Granite (Felsic Plutonic Rock)

Granite

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Diorite (Salt and Pepper Rock)

Diorite

Basalt

Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Basalt

Basalt (Mafic Extrusive)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granite

Granite (Felsic Intrusive)

Granite

Phaneritic Felsic Intrusive Igneous Rock

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Basalt (Purple-tinted scoria/vesicular variety)

Extrusive mafic igneous rock (SiO2 range 45–52%)

Lunar Meteorite (Feldspathic Breccia)

Achondrite, Lunar Meteorite (Feldspathic Breccia)

River Cobble (Salt and Pepper Gneiss)

Gneiss (High-grade regional metamorphic rock)

Vesicular Basalt (Iron-rich)

Scoriaceous Basalt / Oxidized Vesicular Basalt

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Biotite Mica

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

Vesicular Basalt

Aphanitic Mafic Igneous Rock (with Vesicular Texture)

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase phenocrysts)

Granodiorite

Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)

Granite

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

Basalt with Quartz/Quartzite Veins

Aphanitic Mafic Volcanic Rock with Siliceous Infillings

Basalt

Afanitic Mafic Basalt

Basalt

Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Vesicular Basalt (Scoria)

Vesicular Basalt

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Pink Quartz Pebble

Quartz (Silicon Dioxide, SiO2)