Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Mineral Pseudomorph
Browse mineral pseudomorph specimens identified by the Rock Identifier community.
Learn about Mineral Pseudomorph in the encyclopedia
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Galena
Lead Sulfide (PbS)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Fe2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Mica
Muscovite / Biotite (Phyllosilicate group)
mineral
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Mixed Mineral Collection (with Titanium Aura Quartz)
Silicon Dioxide (SiO2) with metallic coatings and various silicates
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Iron Hydroxide/Oxide (Limonite/Goethite)
mineral
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
metamorphic
Fuchsite
Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Limonite Concretion
FeO(OH)qnH2O (Hydrated iron(III) oxide-hydroxide mixture)
sedimentary
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Limonite with Quartz
FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)
mineral
Not a geological specimen
N/A (man-made object)
N/A
Limonite Concretion
Limonite (Hydrated iron oxide) FeO(OH)·nH2O
sedimentary
Quartz in Matrix (Lepidolite or Quartzite)
Silicon Dioxide (SiO2) with host rock
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz with Tourmaline inclusions
Silicon Dioxide (SiO2) with Tourmaline needles
mineral
Quartz with Mica (Muscovite/Biotite)
Silicon Dioxide (SiO2) with Phyllosilicate inclusions
mineral
Quartz with Mica
Silicon Dioxide (Quartz, SiO2) with Muscovite/Biotite Mica
mineral
Smoky Quartz with Rutile Inclusions
Silicon Dioxide (SiO2) with TiO2 needles
mineral
Milky quartz (quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz-rich breccia or altered granite fragment
Polymineralic quartz–feldspar rock, likely hydrothermally altered granite/pegmatite
igneous
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Olivine (Peridot)
(Mg,Fe)2SiO4
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral