Igneous, Sedimentary, Metamorphic, And Mineral

Rhodonite

Manganese silicate: (Mn,Fe,Mg,Ca)SiO3

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Quartz with Mica (Schist/Pegmatite fragment)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Quartz Pebble

Silicon Dioxide (SiO2)

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Petrified Wood

Silicified Wood (SiO2)

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Aventurine (likely Green Aventurine)

Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite

Hematite

Iron (III) Oxide (Fe2O3)

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Green Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Bi-Color Tourmaline (or Watermelon Tourmaline)

Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)

Blue Lace Agate

Silicon Dioxide (SiO₂)

Greenstone / Greenschist

Greenschist (composed of chlorite, epidote, and actinolite)

Petrified Wood

Silicified Wood (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

White Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Banded Agate (Pink Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

White Quartz Pebbles

Quartz (Silicon Dioxide, SiO2)

Carnelian Agate

Carnelian (SiO2 with iron oxide impurities)

Amethyst with Marcasite accents

Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)

Petrified Wood

Silicified Wood (SiO2)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Granite

Granite (a felsic intrusive igneous rock)

Pyrite

Iron Sulfide (FeS2)

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)

Chalcedony (Agate/Carnelian precursor)

Chalcedony (Silicon Dioxide, SiO2)

Carnelian

Carnelian (Silica, SiO2)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Botryoidal Agate

Chalcedony (Silicon Dioxide, SiO2)

Quartzite River Rock (with Limonite staining)

Quartzite (SiO2)

Red Quartz (Carnelian/Red Jasper Agate)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)