Metamorphic And Sedimentary

Browse metamorphic and sedimentary specimens identified by the Rock Identifier community.

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Mineral

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Banded Gneiss (River Rock/Pebble)

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

Metamorphic Rock

Rhodonite

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

mineral

Vesuvianite (Idocrase)

Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10

mineral

Hypersthene

Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)

mineral

Sodalite

Na8(Al6Si6O24)Cl2

mineral

Phyllite

Phyllite (Foliated metamorphic rock)

metamorphic

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

mineral

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

Mineral

Jade

There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.

Mineral

Rhodonite

Rhodonite (MnSiO3)

Mineral

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Mineral

Peacock Ore

Bornite (Cu5FeS4)

mineral

Biotite (Mica)

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

mineral

Rhodonite

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

mineral

Mica

Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

mineral

Epidote in Quartz (Epidosite)

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

metamorphic

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)

metamorphic

Rhodonite

Rhodonite (Mn2+SiO3)

mineral

Yellow Aventurine (Yellow Quartzite)

Silicon Dioxide (SiO2) with inclusions

metamorphic

Yellow Aventurine

Quartz (Silicon Dioxide - SiO2) with inclusions of Mica

Mineral

Rhodonite

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

mineral

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Prase or Green Quartz

Silicon Dioxide (SiO2 with actinolite or chlorite inclusions)

Mineral

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Mineral

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Metamorphic/Igneous (Hydrothermal)

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Mineral

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Mineral