Mineral, Often Found In Metamorphic Rocks But Also In Sedimentary And Igneous Rocks

Browse mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks specimens identified by the Rock Identifier community.

Magnetite or Hematite-rich Ore

Magnetite (Fe3O4) or Hematite (Fe2O3)

mineral

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

mineral

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Corundum (Ruby/Sapphire crystal)

Al2O3 (Aluminum Oxide)

mineral

Biotite on Matrix

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

mineral

Milky Quartz

Quartz (SiO2)

Mineral

Gneissic River Pebble

Gneiss

metamorphic

Epidote

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

metamorphic

Quartz

Silicon Dioxide (SiO2)

mineral

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Metamorphic Rock

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

mineral

Olivine (Peridot when gem-quality)

Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

mineral

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

mineral

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

mineral

Gneiss

High-grade metamorphic rock (Gneiss)

metamorphic

Pyrite

Iron Disulfide (FeS2)

mineral

Orange Calcite

Calcite (CaCO3)

Mineral

Galena

Lead(II) sulfide (PbS)

mineral

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Mineral

Sodalite

Na8(Al6Si6O24)Cl2

mineral

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

mineral

Ruby in Zoisite

Anyolite (Zoisite with Corundum) Member of the Epidote Group

metamorphic

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

mineral

Coarse Sand or Fine Gravel

Detrital Sedimentary Fragments (mostly SiO2)

sedimentary

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

mineral

Pink Chalcedony

Silicon Dioxide (SiO2)

mineral

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Sedimentary Rock