Rock Identifier

Category

Mineral Pseudomorph

Browse mineral pseudomorph specimens identified by the Rock Identifier community.

Learn about Mineral Pseudomorph in the encyclopedia

Pineapple Opal

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Speckled feldspar-rich pebble (Likely leucocratic granite or granitic pegmatite, chiefly potassium feldspar with dark biotite or amphibole) — igneous

Speckled feldspar-rich pebble

Likely leucocratic granite or granitic pegmatite, chiefly potassium feldspar with dark biotite or amphibole

Amygdaloidal Basalt (Amygdaloidal Basalt (containing quartz/agate or zeolite fill)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (containing quartz/agate or zeolite fill)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Sodalite (Na8Al6Si6O24Cl2) — mineral

Sodalite

Na8Al6Si6O24Cl2

Milky quartz (rough quartz specimen) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

Quartz Vein in Hematitic Siltstone (Hydrothermal Quartz (SiO2) in Ferriferous Matrix) — metamorphic

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Dark green mineral specimen, possibly serpentine or epidote (Tentatively serpentine-group mineral, Mg₃Si₂O₅(OH)₄, or epidote, Ca₂(Al,Fe)₃Si₃O₁₂(OH)) — mineral

Dark green mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral, Mg₃Si₂O₅(OH)₄, or epidote, Ca₂(Al,Fe)₃Si₃O₁₂(OH)

Turquoise (Turquoise, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Banded quartz-rich rock (possibly pegmatite) (Likely quartz–feldspar pegmatite; identification is tentative from the photo) — igneous

Banded quartz-rich rock (possibly pegmatite)

Likely quartz–feldspar pegmatite; identification is tentative from the photo

Travertine (Calcium Carbonate (CaCO3)) — sedimentary

Travertine

Calcium Carbonate (CaCO3)

Limonite (Yellow Ochre) (Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)) — mineral

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)

Limonite (Iron Ore) (Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Milky Quartz with Mica Matrix (SiO2 (Silicon Dioxide) with Muscovite/Biotite mica) — mineral

Milky Quartz with Mica Matrix

SiO2 (Silicon Dioxide) with Muscovite/Biotite mica

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

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Fluorite (specifically Blue John or Banded Fluorite) (Calcium Fluoride (CaF2)) — mineral

Fluorite (specifically Blue John or Banded Fluorite)

Calcium Fluoride (CaF2)

Quartz Mineral (Silicon dioxide (SiO2)) — mineral

Quartz Mineral

Silicon dioxide (SiO2)

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Iron-stained quartz vein in altered host rock (Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image) — metamorphic

Iron-stained quartz vein in altered host rock

Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image

Native Copper (Native Copper (Cu)) — mineral

Native Copper

Native Copper (Cu)

Gneiss (Cobble) (Gneiss) — metamorphic

Gneiss (Cobble)

Gneiss

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Tumbled brown quartz (likely smoky quartz) (Quartz, silicon dioxide (SiO₂); brown coloration may be smoky quartz or iron-stained quartz) — mineral

Tumbled brown quartz (likely smoky quartz)

Quartz, silicon dioxide (SiO₂); brown coloration may be smoky quartz or iron-stained quartz

Greenschist (Chlorite Schist (Greenschist Facies)) — metamorphic

Greenschist

Chlorite Schist (Greenschist Facies)

Limonite / Goethite Ironstone Concretion (FeO(OH)·nH2O (Hydrated Iron Oxide)) — mineral

Limonite / Goethite Ironstone Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Fluorite (Calcium fluoride (CaF2)) — mineral

Fluorite

Calcium fluoride (CaF2)

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Gold Mineral (Native Gold (Au)) — mineral

Gold Mineral

Native Gold (Au)

Pyrite on Quartz matrix (Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)) — mineral

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Specular Hematite (Hematite (Fe2O3)) — mineral

Specular Hematite

Hematite (Fe2O3)

Jade (likely Jadeite) (Jadeite (a pyroxene mineral) or Nephrite (a variety of amphibole mineral)) — Mineral

Jade (likely Jadeite)

Jadeite (a pyroxene mineral) or Nephrite (a variety of amphibole mineral)

Clear quartz crystal (tentative) (Quartz, silicon dioxide (SiO₂)) — mineral

Clear quartz crystal (tentative)

Quartz, silicon dioxide (SiO₂)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color) (Calcite) — Mineral

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Pink potassium feldspar (orthoclase/microcline) (KAlSi₃O₈; likely massive potassium feldspar, possibly with quartz) — mineral

Pink potassium feldspar (orthoclase/microcline)

KAlSi₃O₈; likely massive potassium feldspar, possibly with quartz

Copper Ore (Cupriferous Rock / Mixed Mineral Matrix) — igneous

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Black Sand (Magnetite/Heavy Mineral Concentrate) (Magnetite-rich Placers (Fe3O4)) — sedimentary

Black Sand (Magnetite/Heavy Mineral Concentrate)

Magnetite-rich Placers (Fe3O4)

Quartz-rich hydrothermal mineral specimen, possibly vanadinite-bearing matrix (Quartz (SiO₂) with unidentified red-brown accessory minerals; exact species requires testing) — mineral

Quartz-rich hydrothermal mineral specimen, possibly vanadinite-bearing matrix

Quartz (SiO₂) with unidentified red-brown accessory minerals; exact species requires testing

Olivine (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4) — mineral

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Polished greenstone (likely serpentine) (Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄) — metamorphic

Polished greenstone (likely serpentine)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Purple amethyst crystal specimen (Amethyst, purple variety of quartz (SiO₂)) — mineral

Purple amethyst crystal specimen

Amethyst, purple variety of quartz (SiO₂)

Erythrite on Matrix (Cobalt Bloom (Co3(AsO4)2·8H2O)) — mineral

Erythrite on Matrix

Cobalt Bloom (Co3(AsO4)2·8H2O)