Quartz pebble / River stone
SiO2 (Silicon Dioxide)
mineral
Category
Igneous, Sedimentary, And Metamorphic
Browse igneous, sedimentary, and metamorphic specimens identified by the Rock Identifier community.
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Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Magnetite (or Magnetic Iron Ore)
Magnetite (Fe3O4)
mineral
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite River Rock (with Limonite staining)
Quartzite (SiO2)
metamorphic
Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Quartz / Feldspar Specimen
SiO2 (Quartz) / KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar Group)
mineral
Black Tourmaline (Schorl)
NaFe3+3Al6(BO3)3Si6O18(OH)4
mineral
Quartz with inclusions
SiO2
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Corundum
Corundum (Al2O3)
Mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Mica
Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Eclipse Stone (Kabamba Jasper)
Rhyolite with Aegirine (NaFe3+Si2O6)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Labradorite
(Na, Ca)(Si, Al)4O8
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
mineral
Quartz
Quartz (SiO₂)
Mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Quartz (likely heat-treated or colored cord)
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral