Unakite
Epidotized Granite
metamorphic
Category
Metamorphic Mineral
Browse metamorphic mineral specimens identified by the Rock Identifier community.
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Aquamarine
Beryl (Be3Al2Si6O18)
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
sedimentary or metamorphic
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Quartzite Pebble
SiO2 (Silicon Dioxide)
metamorphic
Unakite
Epidotized Granite
metamorphic
Demantoid Garnet on Matrix
Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3
mineral
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Unakite
Epidotized Granite
metamorphic
Unakite
Epidotized Granite
metamorphic
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite)
Metamorphic rock
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Mixed Tumbled Gemstones and River Rocks
Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)
Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)
Calcite
Calcite (CaCO₃)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Hematite
Hematite (Fe2O3)
mineral
Quartzite (River-worn Shiner)
Quartzite (Formula: SiO2)
metamorphic
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
Mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite
Mineral
Tiger's Eye
Tiger's Eye (a variety of Quartz, SiO₂)
Mineral (specifically a gemstone variety)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite pebble
Quartzite (SiO2)
metamorphic
Epidote in Matrix (Unakite-related)
Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
River Quartzite (or Quartz Cobble)
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Fuchsite Gneiss (Green Quartzite)
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic