Metamorphic And Sedimentary

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

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Goldmanite

Conglomerate

Quartzite Sandstone

Breccia

Ironstone

Metabasalt

Eulysite

Metaquartzite

Slate

Anthracite

Marble

Hornfels

Graphite

Graphite (C)

mineral

Chalcopyrite

Chalcopyrite (CuFeS2)

Mineral

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)

Pink Garnet in Matrix

Grossular or Almandine Garnet (X3Y2(SiO4)3)

metamorphic

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Metamorphic, Mineral (within a rock type)

Green Aventurine

Aventurine (Silicon dioxide, SiO₂)

Mineral; variety of Quartz

Biotite on Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Gneiss (likely)

Gneiss

Metamorphic

Amethyst

Amethyst (Silicon Dioxide, SiO2)

mineral

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Jasper with Epidote

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

sedimentary/metamorphic

Arsenopyrite with Schist Matrix

Arsenopyrite (FeAsS)

mineral

Corundum

Corundum (Aluminium oxide, Al2O3)

mineral

Banded Gneiss

Gneiss (variable mineral composition)

metamorphic

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

igneous, sedimentary, and metamorphic

Epidote

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

mineral

Sandstone and Quartzite Specimens

SiO2 with varying mineral/clastic inclusions

sedimentary/metamorphic

Blue Aventurine

Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions

mineral

Green Aventurine

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

mineral

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

mineral

Rhodonite

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

mineral

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

metamorphic/sedimentary

Rhodonite

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

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

Jasper

Chalcedony (Microcrystalline Quartz) - SiO2

sedimentary or metamorphic

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

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