Metamorphic Rock (Primarily Composed Of Minerals)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Granite Pebble

Granite

Gneiss

Gneiss (Metamorphic rock)

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)

Quartzite

Quartzite (composed primarily of SiO2)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)

Quartzite

Quartzite (composed primarily of SiO2)

River Stone / Pebble

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

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Unakite

Epidotized Granite

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)

Gneiss

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

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Serpentinite

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

Pebble (likely Sandstone or Granitic Pebble)

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

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Granite (Weathered)

Phaneritic Felsic Igneous Rock

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Quartzite (Beach Pebble)

Quartzite (composed primarily of SiO2)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Quartzite

Quartzite (composed primarily of SiO2)

Red Sandstone (Iron-Rich)

Arenite (Fe2O3)

Dalmatian Stone

Dalmatian Stone (a fine-grained igneous rock, often misidentified as Dalmatian Jasper)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)

Banded Gneiss

Gneiss (high-grade metamorphic silicate rock)

Ferruginous Sandstone (Gritstone)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))

Quartzite Pebble

Quartzite (composed primarily of Silica, SiO2)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Red Sandstone

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)

Granodiorite

Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2

Gneiss (specifically a Banded Gneiss cobble)

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

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)