Milky quartz vein fragment
Quartz, silicon dioxide (SiO₂)
mineral
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
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Green Slate (Greenstone)
Foliated Metamorphic Rock (rich in Chlorite/Epidote)
metamorphic
Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
Quartzite (or Quartz Slab)
SiO2 (Silicon Dioxide)
metamorphic
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Clear Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Greenstone
Greenschist / Meta-basalt
metamorphic
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)
metamorphic
Amphibolite
Amphibolite (rich in amphibole and plagioclase feldspar)
metamorphic
Gneiss
Gneiss (Metamorphic rock dominated by Quartz, Feldspar, and various dark minerals)
metamorphic
Lapis Lazuli
Lazurite with Calcite and Pyrite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Rounded quartz-rich pebble
Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment
mineral
Smoky Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Gneissic Granite (River Stone)
Protomylonite or Gneiss
metamorphic
Black Star Diopside
Diopside (CaMgSi2O6) with asterism
Mineral
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Quartzite
Quartzite (SiO2 with minor impurities)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Unakite
Epidotized Granite
metamorphic
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Mica Schist
Schist (muscovite/biotite rich regional metamorphic rock)
metamorphic
Arsenopyrite in Quartz/Host Rock
Arsenopyrite (FeAsS)
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic