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

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Granite (Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica) — igneous

Granite

Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica

Quartz-rich pegmatite (milky quartz with feldspar) (Quartz (SiO₂)–feldspar pegmatite, likely containing albite or orthoclase) — igneous

Quartz-rich pegmatite (milky quartz with feldspar)

Quartz (SiO₂)–feldspar pegmatite, likely containing albite or orthoclase

Apatite (Ca5(PO4)3(F,Cl,OH)) — mineral

Apatite

Ca5(PO4)3(F,Cl,OH)

Limonite (Hydrous ferric oxides (FeO(OH)·nH2O)) — sedimentary

Limonite

Hydrous ferric oxides (FeO(OH)·nH2O)

Rainbow Fluorite (Calcium Fluoride (CaF2)) — mineral

Rainbow Fluorite

Calcium Fluoride (CaF2)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Apatite (Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))) — mineral

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Banded Sedimentary Rock (Sedimentary rock with mineral veins/banding) — sedimentary

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Geode half (Geode (often quartz/chalcedony based)) — sedimentary or igneous

Geode half

Geode (often quartz/chalcedony based)

sedimentary or igneous

Gravel and Sediment Sample (Mixed clastic sediment) — sedimentary

Gravel and Sediment Sample

Mixed clastic sediment

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Likely fluorescent mineral specimen (Uncertain; possibly willemite (Zn₂SiO₄) or fluorite (CaF₂)) — mineral

Likely fluorescent mineral specimen

Uncertain; possibly willemite (Zn₂SiO₄) or fluorite (CaF₂)

Serpentine (likely antigorite-rich serpentinite fragment) (Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄) — metamorphic

Serpentine (likely antigorite-rich serpentinite fragment)

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄

Vesicular Basalt / Scoria pebble (Extrusive igneous rock with amygdaloidal infilling) — igneous

Vesicular Basalt / Scoria pebble

Extrusive igneous rock with amygdaloidal infilling

Sedimentary Sandstone with Iron Oxide (Ferruginous Sandstone) — sedimentary

Sedimentary Sandstone with Iron Oxide

Ferruginous Sandstone

Hemimorphite (Hemimorphite (Zn4Si2O7(OH)2·H2O)) — mineral

Hemimorphite

Hemimorphite (Zn4Si2O7(OH)2·H2O)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Potassium Feldspar (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar

Orthoclase (KAlSi3O8)

Pink Feldspar (Orthoclase) (Orthoclase Feldspar (KAlSi3O8)) — mineral

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Blue Apatite (Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Limonite / Iron Oxide Concretion (FeO(OH)·nH2O (Hydrated iron oxide)) — mineral

Limonite / Iron Oxide Concretion

FeO(OH)·nH2O (Hydrated iron oxide)

Weathered rock pebble, possibly quartz-rich sandstone (Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining) — sedimentary

Weathered rock pebble, possibly quartz-rich sandstone

Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Satin Spar (Gypsum) (Calcium Sulfate Dihydrate (CaSO4·2H2O)) — mineral

Satin Spar (Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

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

Limonite / Ironstone

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Shark Tooth Fossil (Chondrichthyes (class) fossilized tooth) — fossil

Shark Tooth Fossil

Chondrichthyes (class) fossilized tooth

Unidentified small mineral specimen (Undetermined from the image) — mineral

Unidentified small mineral specimen

Undetermined from the image

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Chrysocolla on Matrix (Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)) — mineral

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Amethyst (Quartz (Silicon Dioxide, SiO2)) — gemstone

Amethyst

Quartz (Silicon Dioxide, SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Rainbow Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Unknown Rock Fragment (Unknown) — unknown

Unknown Rock Fragment

Unknown

Drill Core Samples (Varied Lithology) (Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)) — igneous, sedimentary, and metamorphic

Drill Core Samples (Varied Lithology)

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

igneous, sedimentary, and metamorphic

Chlorite-rich schist (probable greenschist) (Greenschist-facies metabasalt or chlorite–actinolite schist) — metamorphic

Chlorite-rich schist (probable greenschist)

Greenschist-facies metabasalt or chlorite–actinolite schist

Fossil bone, possibly a large mammal long-bone fragment (Fossilized cortical bone; taxon indeterminate from the photograph) — fossil

Fossil bone, possibly a large mammal long-bone fragment

Fossilized cortical bone; taxon indeterminate from the photograph

Shark Tooth Fossil (Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)) — fossil

Shark Tooth Fossil

Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Native Copper (Copper (Cu)) — mineral

Native Copper

Copper (Cu)

Yellow Ochre / Limonite (Hydrated ferric oxide (FeO(OH)·nH2O)) — mineral

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)