Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
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Gold Mineral
Native Gold (Au)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Green Gneiss or Greenschist
Chlorite/Actinolite Gneiss or Schist
metamorphic
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
Geode (Unopened)
Quartz/Chalcedony concretion
sedimentary
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Pyrite (FeS2)
Mineral
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Schist
Schist
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Gold
Native gold (Au)
mineral
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Mica
Mica group (often Muscovite or Biotite)
mineral
Muscovite Mica
Muscovite KAl2(AlSi3O10)(OH)2
mineral
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly massive magnetite/ironstone
mineral
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Quartz / Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Bronzite
Enstatite (magnesium iron silicate), (Mg,Fe2+)SiO3
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Schist
Schist (Crystalline Metamorphic Rock)
metamorphic
River Pebble
Weathered Rock Fragment
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Probable weathered sulfide-bearing rock
Indeterminate; possibly pyrite- or chalcopyrite-bearing matrix
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral