Metamorphic Rock (Primarily Composed Of Minerals)

Green Slate Pebble (Serpentine / Greenschist Pebble)

Greenschist / Low-grade Metamorphic Rock

Diorite

Diorite (Intermediate intrusive igneous rock)

Granite

Phaneritic Felsic Igneous Rock

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Sandstone

Arenite

Red-and-black slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Lapis Lazuli

Lapis Lazuli (Complex rock primarily composed of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

Likely quartz-rich stone (possibly quartzite)

Quartzite, composed predominantly of quartz (SiO₂)

Sandstone

Arenite (primarily Quartz-rich sedimentary rock)

Likely slate fragment

Slate; fine-grained foliated metamorphic rock composed mainly of clay minerals, quartz, and mica

Sandstone

Arenite (primarily SiO2)

Sandstone with Bedding Planes

Arenite (Sedimentary rock composed primarily of sand-sized minerals)

Dark speckled granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Bauxite

Bauxite (Al2O3·nH2O)

Red Sandstone

Arenite

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Gray slate

Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)

Polished green tumbled stone, likely serpentine

Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Granite

Granite (Phaneritic Acidic Igneous Rock)

Quartz vein in dark metamorphic rock

Likely quartz-rich vein cutting a biotite- or amphibole-rich metamorphic host; exact host rock cannot be confirmed from the image

Biotite Schist

Schist (Biotite-dominated)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Pebble)

Arenite (SiO2 based)

Sandstone

Arenite (primarily Quartz-based Sandstone)

Sandstone

Quartzose Sandstone (Sedimentary Rock)

Sandstone

Sedimentary Rock (Quartz arenite)

Quartz-rich rock, likely granite or quartz-bearing metamorphic rock

Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Sandstone Pebble

Arenite

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone (Quartz-rich)

Arenite

Sandstone (Quartzose)

Arenite (primarily SiO2)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Staurolite-bearing mica schist (probable)

Mica schist composed chiefly of muscovite/biotite, quartz, and likely staurolite or garnet

Unakite

Altered Granite (Granitic Metamorphic Rock)

Eclogite

Eclogite (Omphacite-Garnet rock)