Metamorphic (Low Grade)

Browse metamorphic (low grade) specimens identified by the Rock Identifier community.

White Marble

Recrystallized Calcite / Calcium Carbonate (CaCO3)

metamorphic

Tiffany Stone

Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)

metamorphic

Blue Kyanite

Kyanite (Al2SiO5)

mineral

Pink Quartzite

Quartzite (SiO2 with minor iron oxide impurities)

metamorphic

Smoky Quartz (with complementary stones in jewelry setting)

Smoky Quartz (Silicon Dioxide - SiO2)

mineral

White Sapphire

Corundum (Al2O3)

mineral

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

metamorphic (man-made/engineered)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

mineral

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

mineral

Yellow Quartz (Citrine or Quartz Crystal with Iron Inclusions)

Silicon Dioxide (SiO2)

mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

mineral

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

mineral

Banded Agate (with possible Chalcedony layers)

Silicon dioxide (SiO2)

sedimentary

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Mineral

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

mineral

Ruby

Corundum (Al2O3 with Chromium)

mineral

Blue Kyanite

Kyanite (Al2SiO5)

mineral

Tiger's Eye and Carnelian Quartz

Silicon Dioxide (SiO2)

metamorphic and mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Charoite

(K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4 · nH2O (Hydrated silicate of potassium, calcium, and sodium)

metamorphic

Lapis Lazuli

Lapis Lazuli (Aggregate of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

metamorphic

Petrified Wood

Silicified Wood (SiO2)

metamorphic

Nephrite Jade

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

metamorphic

Jade (Nephrite)

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

metamorphic

Nephrite Jade

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

metamorphic

Pyrite

Pyrite (FeS2)

Mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

mineral

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

mineral

Kyanite

Kyanite (Al2SiO5)

mineral

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Blue Sapphire

Corundum (Al2O3) with iron and titanium impurities

mineral

Mica (Muscovite)

Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2

mineral

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Metamorphic Rock

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

metamorphic

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

metamorphic

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

metamorphic

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)

metamorphic

White Marble

Recrystallized Calcite (CaCO3)

metamorphic

Dinosaur Bone (Gembone)

Agatized Dinosaur Bone (Silicified Paleo-osteoid)

metamorphic

Lapis Lazuli (polished cabochon)

Lazurite-rich rock (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2)

metamorphic