Metamorphic, Likely Sedimentary With Quartz Veins

Pyrite

Iron Sulfide (FeS2)

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Gneiss (Granitic Gneiss)

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

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Black Marble with Quartz Veining

Metamorphosed Limestone (Recrystallized CaCO3)

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Gneiss (with Quartz and Biotite Mica)

Gneiss

Blue Calcite

Calcium Carbonate (CaCO3)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Smoky Quartz

Smoky Quartz (SiO ₂)

Pyrite

Iron Sulfide (FeS2)

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper

Jasper (SiO2 plus impurities)

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Gneiss (Banded Gneiss)

Gneiss

Jasper (Mookaite variety likely)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Gneiss

Gneiss

Prase quartz with actinolite inclusions

Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions

Jasper Breccia

Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Gneiss (specifically Banded Gneiss)

Gneiss

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Milky Quartz Geode Fragment

Silicon Dioxide (SiO2)

Citrine Quartz Crystal Cluster

Silicon Dioxide (SiO2) with iron impurities

Petrified Wood

Silicified Wood (SiO2)

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

Ferruginous Quartz (Carnelian-tinted Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite (Rounded Pebble)

Quartzite (predominantly SiO2)

Jasper with Cinnabar (Dragon Blood Jasper variant)

Silicon Dioxide with Mercury Sulfide (SiO2 + HgS)

Gneiss

High-grade metamorphic rock (Gneiss)