Mineral On Igneous Rock

Basalt River Stone

Basalt

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Diorite

Phaneritic intermediate plutonic rock

Milky Quartz

Silicon Dioxide (SiO2)

Vesicular Basalt

Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Vesicular Basalt

Basalt with secondary mineral infilling (Amygdaloidal Basalt)

Granite

Granite (a felsic intrusive igneous rock)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Granite

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

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Amethyst

Amethyst (Silicon Dioxide with iron impurities), SiO2

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Gneiss (Metamorphic Rock)

Gneiss

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Metagabbro / Epidote Gneiss

Epidote bearing Hornblende Gneiss

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Diorite

Diorite (Intermediate intrusive igneous rock)

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Basalt with Secondary Mineral Inclusions

Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Granite

Granite (a felsic intrusive igneous rock)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Basalt with Quartz Veins

Basalt (composition: SiO2, MgO, FeO, Al2O3, CaO)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Gneiss

High-grade foliated metamorphic rock

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Carnelian Agate

Carnelian (SiO2 with iron oxide impurities)

Diorite

Diorite (Intermediate intrusive igneous rock)

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Quartz / Vein Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Pyrite (on host rock/ore)

Iron Sulfide (FeS2)