Mineral In Igneous Rock

River Cobble (likely Basalt or Rhyolite)

Extrusive Igneous Rock (Mafic or Intermediate)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Quartz Pebble

Silicon Dioxide (SiO2)

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

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

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Basalt with Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Banded Gneiss

Gneiss (Metamorphic Rock)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Basalt with Quartz/Plagioclase Inclusions

Mafic volcanic rock (Basaltic)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Granite

Granite (High-silica plutonic rock)

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

Granite

Granite (Felsic Plutonic Rock)

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Scoria (Vesicular Basalt)

Scoria (Extrusive Igneous Rock)

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Pink Granite

Phaneritic Felsic Igneous Plutonic Rock

Granite

Phaneritic Felsic Igneous Rock (Granite)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Milky Quartz (with Iron Oxide staining)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt-Amugydule (Amygdaloidal Basalt)

Aphanitic Mafic Igneous Rock with Vesicle Infillings

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Agate (Moss or Plume Agate variety)

Silicon Dioxide (SiO2)

Feldspathic Granite (likely Syenite or Granite Pegmatite)

Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)

Gneiss

Gneiss

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Olivine-bearing Basalt / Scoria

Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)