Mineral, Part Of A Rock

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Amygdaloidal Basalt

Amygdaloidal Basalt

Milky Quartz

Silicon Dioxide (SiO2)

Moonstone

Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)

Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

White Marble

Recrystallized Calcite (CaCO3)

Banded Gneiss

Gneiss

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Tiffany Stone

Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz with Iron Oxide Monzonite or Sandstone contact

Quartz (SiO2) with Limonite/Hematite staining

Petrified Wood

Silicified Wood (SiO2)

Granite

Granite (compositionally: Quartz, Feldspar, Mica)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of iron oxide)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Vesicular Basalt (or Scoria)

Vesicular Basalt (Aphanitic-vesicular volcanic rock)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Calcite Geode

Calcium Carbonate (CaCO3)

Gneiss

Gneiss

Biotite Mica in Host Rock

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

Sandstone (Graywacke type)

Clastic Sedimentary Rock (Lithic Sandstone)

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Granite Pebble (River Rock)

Granite (composed primarily of Quartz, Feldspar, and Mica)

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Oolitic Chert

Silicon Dioxide (SiO2) with Oolitic texture