Rock Identifier

Category

Metamorphic Or Igneous Alteration

Browse metamorphic or igneous alteration specimens identified by the Rock Identifier community.

Sandstone or Quartzite (Arenite (if sedimentary) / Quartzite (if metamorphic)) — Sedimentary or Metamorphic

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Sedimentary or Metamorphic
Rhodonite (Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃) — mineral

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃

mineral
Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

mineral
Galena (Lead(II) sulfide (PbS)) — mineral

Galena

Lead(II) sulfide (PbS)

mineral
Rhodonite (Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)) — mineral

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

mineral
Vesuvianite (Idocrase) (Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10) — mineral

Vesuvianite (Idocrase)

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

mineral
Quartzite pebble (Quartzite (SiO2 based)) — metamorphic

Quartzite pebble

Quartzite (SiO2 based)

metamorphic
Prehnite (Prehnite, Ca2Al2Si3O10(OH)2) — mineral

Prehnite

Prehnite, Ca2Al2Si3O10(OH)2

mineral
Polished Rhodonite Obelisk (Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3) — metamorphic

Polished Rhodonite Obelisk

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3

metamorphic
Aventurine (Silicon Dioxide (SiO2 with inclusions of Fuchsite mica)) — mineral

Aventurine

Silicon Dioxide (SiO2 with inclusions of Fuchsite mica)

mineral
Rhodonite (Rhodonite (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

mineral
Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

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

mineral
Specular Hematite (Specularite) in Matrix (Specularite (Fe2O3)) — mineral

Specular Hematite (Specularite) in Matrix

Specularite (Fe2O3)

mineral
Grey Agate (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

mineral
Quartzite (Quartzite (mainly Silicon Dioxide, SiO2)) — metamorphic

Quartzite

Quartzite (mainly Silicon Dioxide, SiO2)

metamorphic
Yellow Jade (Jadeite or Nephrite (NaAlSi2O6 or Ca2(Mg,Fe)5Si8O22(OH)2)) — metamorphic

Yellow Jade

Jadeite or Nephrite (NaAlSi2O6 or Ca2(Mg,Fe)5Si8O22(OH)2)

metamorphic
Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic
Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

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

mineral
Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

mineral
Rhodonite (Manganese silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

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

mineral
Rhodonite (Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn+2,Fe+2,Mg,Ca)SiO3) — mineral

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn+2,Fe+2,Mg,Ca)SiO3

mineral
Rhodonite (Rhodonite (Manganese Iron Magnesium Calcium Silicate)) — mineral

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate)

mineral
Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

mineral
Yellow Aventurine (Silicon Dioxide (SiO2) with inclusions) — mineral

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusions

mineral
Almandine Garnet (Almandine, Fe3Al2(SiO4)3) — mineral

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

mineral
Banded Agate (Gray/Brown) (Silicon Dioxide (SiO2)) — mineral

Banded Agate (Gray/Brown)

Silicon Dioxide (SiO2)

mineral
Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

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

mineral
Phyllite (Phyllite (Intermediate grade metamorphic rock)) — metamorphic

Phyllite

Phyllite (Intermediate grade metamorphic rock)

metamorphic
Ruby in Zoisite with Hornblende (Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))) — metamorphic

Ruby in Zoisite with Hornblende

Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))

metamorphic
Garnet Schist (Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)) — metamorphic

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

metamorphic
Jadeite (Jade) (Jadeite, NaAlSi₂O₆) — metamorphic

Jadeite (Jade)

Jadeite, NaAlSi₂O₆

metamorphic
Rhodonite (Manganese silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

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

mineral
Fuchsite (Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

mineral
Slate (Slate (Metamorphic Rock)) — metamorphic

Slate

Slate (Metamorphic Rock)

metamorphic
Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

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

mineral
Agate (Agate (Silicon Dioxide, SiO2)) — mineral

Agate

Agate (Silicon Dioxide, SiO2)

mineral
Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

mineral
Yellow Jade (Jadeite or Nephrite (various silicates)) — metamorphic

Yellow Jade

Jadeite or Nephrite (various silicates)

metamorphic
Pyrite in Matrix (Iron Disulfide (FeS2)) — mineral

Pyrite in Matrix

Iron Disulfide (FeS2)

mineral
Ruby (Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — mineral

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

mineral
Green Quartz / Aventurine (Silicon Dioxide (SiO2) with inclusions) — Metamorphic

Green Quartz / Aventurine

Silicon Dioxide (SiO2) with inclusions

Metamorphic
Aventurine (Tan/Cream colored) (Quartz (SiO2) with mineral inclusions) — mineral

Aventurine (Tan/Cream colored)

Quartz (SiO2) with mineral inclusions

mineral