Metamorphic Or Sedimentary Depending On Local Grade

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Fuchsite Quartzite

Fuchsite-bearing Quartzite

Magnetite / Iron Ore

Magnetite (Fe3O4)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous Phosphate of Copper and Aluminum)

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Red Jasper

SiO2 (Silicon Dioxide with Iron inclusions)

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Yellow Quartzite (River Stone)

Quartzite (primarily SiO2)

Petrified Wood

Silicified wood (primarily SiO2)

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Calcite

Calcium Carbonate (CaCO3)

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Sandstone

Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amethyst with Marcasite accents

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

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Limonite (also known as Yellow Ochre or Brown Hematite)

Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite inclusions

Quartzite (River Stone)

Quartzite (mainly SiO2 with iron oxide staining)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Quartz (Milky/Cloudy Variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Petrified Wood (Silicified Wood)

Silicified fossil wood (SiO2)

Tiger's Eye (commonly referred to as Blue/Gold Tiger's Eye)

Tiger's Eye is a variety of Chalcedony (cryptocrystalline quartz), SiO2, exhibiting chatoyancy. The blue variety is often called Hawk's Eye.

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Turquoise

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

Sandstone

Sandstone (lithified sand)

Quartzite River Stone

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

White Marble

Recrystallized Calcite (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Rhodonite

Manganese Inosilicate (MnSiO3)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Dragon Blood Jasper

Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))