Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Magnetite or Magnetic Iron Ore
Magnetite (Fe3O4)
mineral
Tiger's Eye
Pseudomorph of Crocidolite (SiO2 with iron oxides)
mineral
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Granodiorite
Granodiorite
igneous
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Sandstone (likely Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
River Stone (Sandstone with Oxide Banding)
Arenite with Iron/Manganese Oxide inclusions
sedimentary
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Amethyst (Purple), Sulfur (Yellow), and Blue Apatite
SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Greenschist
Chlorite schist
metamorphic
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt
Basalt (extrusive igneous rock)
Igneous
Granodiorite
Granodiorite (calc-alkaline phaneritic igneous rock)
igneous
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (in Gold Jewelry)
Carbon (C)
mineral
Garnet
Garnet Group (Silicate Minerals)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Faceted Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Aventurine
Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)
metamorphic
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Gneiss
Gneiss
metamorphic
Quartzite (specifically Milky Quartz variety)
Quartz (SiO2)
metamorphic
Unakite or Epidosite
Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)
metamorphic
Diamond
Carbon (C)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral