Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic (Pseudo Igneous)
Browse metamorphic (pseudo igneous) specimens identified by the Rock Identifier community.
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Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Quartz
Silicon dioxide (SiO2)
mineral
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Faceted Clear Quartz or Diamond Simulant
Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Quartz / Feldspar Specimen
SiO2 (Quartz) / KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar Group)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
NaFe3+3Al6(BO3)3Si6O18(OH)4
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with inclusions
SiO2
mineral
Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist
Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing
metamorphic
Magnetite (or Magnetic Iron Ore)
Magnetite (Fe3O4)
mineral
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Feldspar in Matrix
Feldspar group minerals in metamorphic or igneous matrix
igneous
Polished gray stone, likely labradorite or gneiss
Indeterminate from image; possibly plagioclase-rich gneiss or labradorite-bearing rock
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
mineral
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Biotite mica
Biotite, a potassium-rich mica in the annite–phlogopite series; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Biotite mica (likely)
Biotite, a mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Labradorite
(Na, Ca)(Si, Al)4O8
mineral
Quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Quartz-rich pebble
Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment
mineral
Likely weathered gneiss or mica-rich schist
Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist
metamorphic
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Small dark mineral or rock fragment
Undetermined; possibly a dark mafic mineral such as biotite or magnetite
mineral