Mineral And Metamorphic Rock

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Granite

Granite (a felsic intrusive igneous rock)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Serpentinite

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)

Gneiss (with Quartz and Mica)

Gneiss

Quartzite

Quartzite (primarily SiO2)

Diamond (Cluster Ring)

Carbon (C)

Rough Diamond

Diamond (Native Carbon), C

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Diamond

Natural Carbon (C)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Red Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Green Aventurine

Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Unakite

Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Quartzite (Iron-stained)

Metamorphosed Quartz-rich Rock (SiO2)

Nephrite Jade / Pounamu

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Unakite (Epidotized Granite)

Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)

Serpentinite

Serpentinite ((Mg,Fe,Ni,Al)3Si2O5(OH)4)

Unakite

Epidotized Granite

Quartzite (Ferruginous)

Quartzite (major component SiO2 with Fe2O3 impurities)

Quartzite with Quartz Veins

Quartzite (chiefly SiO2)

Unakite

Epidotized Granite

Unakite

Epidotized Granite

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Serpentine (Lizardite)

Serpentine subgroup, Mg3Si2O5(OH)4

Quartzite

Quartzite (predominantly SiO2)

Quartzite Pebbler

Quartzite (mainly SiO2)

Unakite

Epidotized Granite

Unakite

Unakite (Metasomatized Granodiorite)

Serpentine

Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)

Unakite

Unakite (Epidotized Granite)

Quartzite River Pebble

Quartzite (primarily SiO2)

Quartzite (Quartz-rich Cobble)

Quartzite (SiO2)