Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites) in the encyclopedia
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Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
Igneous
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst Geode
Quartz (SiO₂) with iron impurities
Mineral/Igneous (secondary formation)
Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Epidote in Matrix (Unakite-like Rock Fragment)
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble
metamorphic
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Bull Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Cream Quartz Bead
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Amethyst (as seen in jewelry)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tourmaline (Schorl or Dravite) on Matrix
Complex Borosilicate - Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH,F)4
mineral
Quartz-filled Basalt Geode
Amygdaloidal Basalt with Quartz (SiO2)
igneous
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral