Rock Identifier

Category

Mineral Pseudomorph

Browse mineral pseudomorph specimens identified by the Rock Identifier community.

Malachite (Copper carbonate hydroxide Cu2CO3(OH)2) — mineral

Malachite

Copper carbonate hydroxide Cu2CO3(OH)2

Agate (Silicon dioxide (SiO2)) — mineral

Agate

Silicon dioxide (SiO2)

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

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

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

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Amethyst and Peridot (Amethyst (SiO2 with iron impurities) and Peridot ((Mg, Fe)2SiO4)) — mineral

Amethyst and Peridot

Amethyst (SiO2 with iron impurities) and Peridot ((Mg, Fe)2SiO4)

Septarian Nodule (Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)) — sedimentary

Septarian Nodule

Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)) — Igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)

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

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

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

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Banded Slate or Siltstone with Quartz/Calcite Veins (Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)) — metamorphic

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Amethyst (Quartz) (Silicon Dioxide (SiO2)) — mineral

Amethyst (Quartz)

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite/Adventurine) (Silicon Dioxide (SiO2) with inclusions) — mineral

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide (SiO2) with inclusions

Alexandrite in Matrix (Chrysoberyl (BeAl2O4 with Chromium impurities)) — mineral

Alexandrite in Matrix

Chrysoberyl (BeAl2O4 with Chromium impurities)

Citrine Quartz Crystal Cluster (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz Crystal Cluster

Silicon Dioxide (SiO2) with iron impurities

Hypersthene (Hypersthene ((Mg,Fe)SiO3)) — mineral

Hypersthene

Hypersthene ((Mg,Fe)SiO3)

Amethyst (Amethyst (Silicon Dioxide - SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Gold Ore (Auriferous Quartz with Chalcopyrite/Pyrite) (Au (Native Gold) in Quartz (SiO2) with FeS2 (Pyrite) or CuFeS2 (Chalcopyrite)) — Mineral

Gold Ore (Auriferous Quartz with Chalcopyrite/Pyrite)

Au (Native Gold) in Quartz (SiO2) with FeS2 (Pyrite) or CuFeS2 (Chalcopyrite)

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Hematite/Limonite impurities) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Biotite on Matrix (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite on Matrix

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

Amethyst (SiO2 (Silicon Dioxide with Iron impurities)) — mineral

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Blue Lace Agate (Silicon Dioxide (SiO2)) — mineral

Blue Lace Agate

Silicon Dioxide (SiO2)

Tektite (Indochinite) (Tektite (impactite), primarily high-silica glass (SiO2)) — igneous

Tektite (Indochinite)

Tektite (impactite), primarily high-silica glass (SiO2)

Amethyst Quartz (Amethyst (SiO2 with Iron impurities)) — mineral

Amethyst Quartz

Amethyst (SiO2 with Iron impurities)

Moonstone (Orthoclase Feldspar) ((K,Na)AlSi3O8) — mineral

Moonstone (Orthoclase Feldspar)

(K,Na)AlSi3O8

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

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Pink Orthoclase Feldspar with Dendrites (Orthoclase (KAlSi3O8) with Manganese Oxide dendrites) — mineral

Pink Orthoclase Feldspar with Dendrites

Orthoclase (KAlSi3O8) with Manganese Oxide dendrites

Amethyst (Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Epidote (likely Unakite component or Epidosite) (Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))) — metamorphic

Epidote (likely Unakite component or Epidosite)

Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))

Celestine (or Celestite) on Matrix (Celestine (SrSO4)) — mineral

Celestine (or Celestite) on Matrix

Celestine (SrSO4)

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

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Geode (Unbroken) (Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony) — sedimentary

Geode (Unbroken)

Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony

Sulfide Ore (likely Galena and Sphalerite in Quartz) (Lead-Zinc Ore (PbS and ZnS)) — mineral

Sulfide Ore (likely Galena and Sphalerite in Quartz)

Lead-Zinc Ore (PbS and ZnS)

Amazonite (Potassium Feldspar (KAlSi3O8)) — mineral

Amazonite

Potassium Feldspar (KAlSi3O8)

Amethyst (SiO2 (Silicon Dioxide with Iron impurities)) — mineral

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Heliotrope (Bloodstone) (Silicon dioxide (SiO2) with inclusions) — mineral

Heliotrope (Bloodstone)

Silicon dioxide (SiO2) with inclusions

Beryl (Aquamarine) in Matrix with Schorl (Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)) — mineral

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Amethyst (Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Chalcedony (specifically Agate or Carnelian variety) (Cryptocrystalline Silica (SiO2)) — mineral

Chalcedony (specifically Agate or Carnelian variety)

Cryptocrystalline Silica (SiO2)