Metamorphic And Sedimentary

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

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Sorosilicate [Ca2Al2Fe3+Si3O12(OH)]

sedimentary/metamorphic

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

mineral

Banded Gneiss

Gneiss (variable mineral composition)

metamorphic

Rhodonite

Manganese silicate (MnSiO3)

mineral

Bornite

Bornite (Cu5FeS4)

mineral

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral

Corundum

Corundum (Aluminium oxide, Al2O3)

mineral

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

metamorphic/sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Mineral / Sedimentary

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Mineral, often a rock given its aggregate nature

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Seraphinite (Clinochlore)

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

mineral

Rhodonite

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

mineral

Biotite or Phlogopite Mica

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

mineral

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Metamorphic

Banded Gneiss

Gneiss

Metamorphic

Quartz

Silicon Dioxide (SiO2)

Mineral

Arsenopyrite with Schist Matrix

Arsenopyrite (FeAsS)

mineral

Jasper and Quartz River Cobble

Silicon Dioxide (SiO2) with Hematite inclusions

Sedimentary / Metamorphic

Rhodonite

Rhodonite (Mn, Fe, Mg, Ca)SiO3

mineral

White Quartz

Quartz (SiO2)

Mineral

Rhodonite

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

mineral

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

metamorphic

Green Aventurine

Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

mineral

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

mineral

Blue Aventurine

Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions

mineral

Rhodonite

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

mineral

Greenschist

Chlorite-actinolite schist

metamorphic

Corundum

Corundum (Al2O3)

Mineral

Biotite Mica

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

mineral

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

metamorphic

Banded Gneiss

Gneiss (pronounced "nice")

metamorphic

Jasper and Quartzite mix

Silicon Dioxide (SiO2) with impurities

sedimentary or metamorphic

Rhodonite

Rhodonite (Manganese Silicate), chemical formula: (Mn,Fe,Mg,Ca)SiO3

Mineral

Rhodonite

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

mineral

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

metamorphic

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

mineral

Pyrite

Pyrite (FeS2)

Mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral