Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
Category
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
Marble
Recrystallized Carbonate Rock (CaCO3)
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
Amygdaloidal Basalt
Amygdaloidal Basalt
Conglomerate
Conglomerate (a clastic sedimentary rock)
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
Quartzite (Yellow/Tan)
Metamorphic Rock composed of Quartz (SiO₂)
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
Sandstone
Arenite (primarily SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Ferruginous Sandstone (Gritstone)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))
Banded Gneiss
Gneiss (variable mineral composition)
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
Unakite
Unakite (Epidotized Granite)
Gneiss (Metamorphic Rock)
Gneiss
Schist
Mica Schist (contains muscovite/biotite and quartz)
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
Sandstone
Sandstone (clastic sedimentary rock)
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
Red Sandstone
Arenite (high iron oxide content)
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
Gneiss
Gneiss
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
Montana Moss Agate
Chalcedony (Silicon Dioxide, SiO2)
Quartzite
Quartzite (composed primarily of SiO2)
Sandstone
Arenite (SiO2 + various cementing minerals)
Milky Quartz
Silicon Dioxide (SiO2)
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
Quartzite
Quartzite (composed mainly of SiO2)
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Chert (White-Tan variety)
Silicon dioxide (SiO2) / Microcrystalline Quartz