Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Sedimentary, Metamorphic
Browse igneous, sedimentary, metamorphic specimens identified by the Rock Identifier community.
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Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Crystal Point
Silicon Dioxide (SiO2)
mineral
Gold Mineral
Native Gold (Au)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Magnetite
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Banded Metamorphic Rock
Gneiss or Schist
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Dark gray rounded river pebble
Likely basalt or fine-grained volcanic rock; exact identification requires testing
igneous
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Schist
Metamorphic Rock (Schist)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Vein
Metamorphic Gneiss
metamorphic
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Amethyst and mixed gemstone bracelet
Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads
gemstone
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Greenschist
Chlorite schist
metamorphic
Greenschist
Chlorite schist
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary