Rock

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Chert (vuggy/nodular)

Microcrystalline Quartz (SiO2)

Granite

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Basalt

Basalt

Sandstone

Arenite (primarily SiO2)

Unakite

Unakite (Altered Granite consisting of Orthoclase KAlSi3O8, Epidote Ca2(Al,Fe)3(SiO4)3(OH), and Quartz SiO2)

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions

Scoria (Lava Rock)

Mafic Volcanic Scoria

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica/Amphibole)

Granite (Pink/Red Orthoclase variety)

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

Granite

Phaneritic Plutonic Felsic Rock (Granite)

Druzy Quartz (part of a Geode)

Silicon Dioxide (SiO2)

Rough Star Sapphire (Corundum)

Al2O3 (Aluminum Oxide)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)

Quartzite Pebble

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Greenstone

Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Calcite Geode

Calcium Carbonate (CaCO3)

Granite

Granite (a felsic intrusive igneous rock)

Granite

Granite (a felsic intrusive igneous rock)

Epidote in Basalt

Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Granodiorite

Granodiorite (intermediate intrusive igneous rock)

Basalt River Stone (Tumbled)

Basalt (Mafic Extrusive Igneous Rock)

Granite Glacial Erratic

Intrusive Phaneritic Felsic Rock (Granite)

Basalt

Basalt (Mafic Aphanitic Igneous Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Granite Pebble

Granite (Phaneritic Acidic Igneous Rock)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony