Metamorphic Rock (Specifically A Rock Composed Of Minerals)

River Pebble (Gabbro or Basalt)

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Granite

Phaneritic plutonic rock (composed of quartz, alkali feldspar, and plagioclase)

Green Aventurine

Quartz (Silicon Dioxide) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Quartzite

Quartzite (primarily SiO2)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Quartzite pebble

Metamorphic Quartzite (primarily SiO2)

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Tiger's Eye

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

Quartzite

Quartzite (SiO2)

Rock Crystal Quartz

Quartz (SiO₂)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)

River Pebble (Quartzite/Sandstone mix)

Quartzite (primarily SiO2)

Shale

Fissile mudstone (rich in clay minerals and quartz)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Sandstone (Painted)

Arenite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Red Quartzite / Metasandstone River Pebble

Quartzite (primarily SiO2 with hematite inclusions)

River Cobble (Quartzite with Iron Staining)

Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Vesicular Basalt with Lichen

Vesicular Basalt

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Quartzite

Quartzite (primarily SiO2)

Halite

Halite (Sodium Chloride, NaCl)

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

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

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Iron Meteorite

Iron-nickel alloy (primarily kamacite and taenite)