Metamorphic Rock (Primarily Composed Of Minerals)

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

Tumbled brown quartzite pebble

Quartzite, composed predominantly of microcrystalline quartz (SiO₂)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Mica-rich schist (likely mica schist)

Mica schist, composed mainly of muscovite and/or biotite mica with quartz and feldspar

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Ammonite Fossil

Ammonoidea (primarily composed of Calcite, CaCO3)

Sandstone (River Cobble)

Sandstone (primarily composed of silica, SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Quartzite

Metamorphic rock (primarily SiO2)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Limestone or Sandstone Cobble

Sedimentary rock (Calcium carbonate or Quartz based)

Granite

Intrusive Felsic Igneous Rock

Sandstone

Arenite (primarily SiO2)

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Magnetite

Fe3O4 (Iron(II,III) oxide)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Gneiss

Gneissic Metamorphic Rock

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Likely slate fragments

Slate, a fine-grained metamorphic rock composed chiefly of quartz, mica, and chlorite

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

Sandstone

Arenite (composed primarily of SiO2)

River Pebble (Greywacke / Basalt Pebble)

Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock)

Serpentinite

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

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Greenstone (Amygdaloidal Basalt)

Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)

Granite

Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)

Serpentine-rich rock (likely antigorite serpentinite)

Serpentinite, composed mainly of serpentine-group minerals such as antigorite, lizardite, or chrysotile

Conglomerate

Conglomerate (Clastic sedimentary rock)

Sandstone (with secondary weathering/concretion)

Arenite (composed primarily of Quartz, SiO2)