Metamorphic Rock (Composed Of Multiple Minerals)

Sandstone with Iron Weathering

Quartz Arenite / Weathered Sandstone

Mica Schist

Schist (Mica-rich Metamorphic Rock)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Gneiss

Gneiss

Polished serpentine (likely green serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with magnetite and possible chromite or carbonate inclusions

Gneissic Granite

Granite Gneiss

Red Sandstone

Arenite (primarily Quartz and Iron Oxide)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Granite

Felsic intrusive igneous rock

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Quartz Pebble (with Feldspar/Mica)

Granitic Quartz / SiO2 with KAlSi3O8

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Sandstone (Pebble)

Arenite (SiO2 based)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Granite (Pebble)

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Sandstone

Arenite (SiO2 based typically)

Eclogite

Eclogite (composed primarily of Omphacite and Pyrope Garnet)

Eclogite

Eclogite (composed primarily of Omphacite and Pyrope Garnet)

Quartz

Silicon Dioxide (SiO2)

Chalcedony (Agate) Pebble

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)

Gneiss

Metamorphic Gneiss

Sandstone Pebble

Sedimentary quartz arenite

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Gneiss

Metamorphic Gneiss

Granite

Granite

Schist

Metamorphic Rock (Schist)

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

Granite

Intrusive Igneous Rock (Felsic)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Fuchsite Gneiss or Schist

Muscovite (variety Fuchsite) within Metamorphic Host Rock

Polished black-and-white granite

Granite, composed mainly of quartz, feldspar, and dark biotite/amphibole minerals

Foliated metamorphic rock, likely gneiss or mica schist

Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph

Banded Gneiss

Gneiss (Metamorphic Rock)

Sandstone

Clastic sedimentary rock

Granite

Intrusive Igneous Rock

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)