Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
Green Kyanite
Kyanite (Al2SiO5)
mineral
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Tiger's Eye
Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)
Mineral
Serpentine
Serpentine group, including Antigorite, Lizardite, and Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Corundum
Corundum (Al2O3)
Mineral
Slate with Red Sandstone Landscaping Rock
Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone
metamorphic and sedimentary
Quartzite (River Cobble)
Metamorphic Rock (composed predominantly of SiO2)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Epidote
Epidote - Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Garnet-Mica Schist
Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Quartz
Quartz (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
metamorphic
Schist
Mica Schist
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Kidney Stone (Medical Specimen)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
Mineral (Biogenic)
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Venetian Gold Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Unakite
Unakite (Epidotized Granite)
metamorphic
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite phyllosilicates)
metamorphic
Pyrite with Iron Oxides (Fool's Gold in Matrix)
Iron Sulfide (FeS2)
mineral
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Slate
Phyllo-silicate based metamorphic rock
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic