Quartz Pebble
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 Tiger's Eye
Silicified Crocidolite (Quartz variety, SiO2)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite Gneiss
Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)
metamorphic
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Likely serpentine pebble
Serpentinite; predominantly serpentine-group minerals, Mg₃Si₂O₅(OH)₄
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite with Quartz Vein
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Raw Agate (Rough Agate Nodule)
SiO2 (Microcrystalline Quartz / Chalcedony)
mineral
Likely weathered quartz-rich rock fragment
Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock
igneous
Garnet Gneiss
Garnetiferous Gneiss
metamorphic
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Gray Slate Pebble
Slate (metamorphosed mudstone/shale)
metamorphic
Gneiss
Gneiss
metamorphic
Milky quartz (rough quartz chunk)
Quartz, silicon dioxide (SiO₂)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Milky Quartz on Matrix
Quartz (Silicon Dioxide, SiO2)
mineral
Diorite Gneiss
Foliated Diorite Gneiss
metamorphic
Quartz (Milky/Common)
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (Quartz-Biotite-Muscovite Schist)
metamorphic
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Spinifex Texture Komatiite
Komatiite (Ultramafic Volcanic Rock)
igneous
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Mica Schist
Mica Schist (Intermediate-grade Metamorphic Rock)
metamorphic
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Banded gneiss, probably granitic gneiss
Foliated gneiss composed mainly of quartz (SiO₂), feldspar—orthoclase/microcline and plagioclase—and dark mica, commonly biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
metamorphic
Weathered quartz-rich pebble (tentative)
Likely quartz/chalcedony, SiO₂, possibly iron-stained
mineral
Stichtite in Serpentinite (Atlantisite)
Mg6Cr2CO16(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Quartz-rich river pebble, likely milky quartz
Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Eye Agate / Chalcedony)
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Quartz-rich rock fragment, possibly granite or quartzite
Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining
igneous or metamorphic
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic