Metamorphic Rock (Composed Of Multiple Minerals)

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Desert Rose (Baryte/Gypsum Rosette)

Baryte (BaSO4) or Gypsum (CaSO4·2H2O)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Gneiss

Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Marble

Metamorphic Limestone (CaCO3)

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Slate

Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Agate Geode / Nodular Chalcedony

Silicon Dioxide (SiO2) with impurities

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Agate

Chalcedony (cryptocrystalline variety of Quartz, SiO2)

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)

Sandstone

Arenite (SiO2 based)

Greenstone / Serpentinite

Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Rock)

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Rainbow Moonstone

White Labradorite (formula: (Na,Ca)(Al,Si)4O8)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)

Dalmatian Jasper / Dalmatian Stone

Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)