Igneous Rock

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Granite

Granite

Milky Quartz with inclusions

Quartz (Silicon Dioxide, SiO2)

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

Amethyst

Silicon dioxide (SiO2) with iron impurities

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Biotite Schist

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

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Gneiss (specifically Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Gneiss (specifically a Granitic Gneiss)

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

Druzy Agate (specifically Black Druzy Agate)

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Greenschist

Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Greenstone (Epidote/Chlorite-rich Metabasalt)

Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite (on Shale/Matrix)

Iron Disulfide (FeS2)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Scoria (Basaltic Lava Rock)

Vesicular Basalt

Diorite (Salt and Pepper Rock)

Diorite

Diorite (Salt and Pepper Rock)

Diorite

Scoria (Red Lava Rock)

Scoria (Vesicular Basalt/Andesite)

Vesicular Basalt (Lava Rock)

Basalt with vesicular texture

River Rock (Basalt/Greywacke)

Aphanitic Basalt or Lithic Sandstone (Greywacke)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Diorite (Salt and Pepper Rock)

Diorite