Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Category
Metamorphic And Igneous Rocks
Browse metamorphic and igneous rocks specimens identified by the Rock Identifier community.
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Kfeldspar (Potassium Feldspar)
KAlSi3O8
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (KAlSi3O8) or Oligoclase with adularescence
gemstone
Garnet
Silicate mineral group (often Pyrope or Almandine in this color range)
gemstone
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Biotite Mica Schist
Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Tumbled Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Fuchsite in Quartz (or Emerald in Fuchsite / Verdite)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz Matrix
metamorphic
Pyrite
Iron Pyrite (FeS2)
mineral
Mica (Biotite or Phlogopite Buchsam)
Silicate Mineral (Phyllosilicate family)
mineral
White Quartz Pendant
Silicon Dioxide (SiO2)
mineral
Sunstone
Feldspar group (Plagioclase / Oligoclase)
mineral
Moonstone
Orthoclase (Potassium Feldspar), (K,Na)AlSi3O8
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Labradorite
Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Fluorite Bracelet
Calcium Fluoride (CaF2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz / Feldspar Specimen
SiO2 (Quartz) / KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar Group)
mineral
Black Tourmaline (Schorl)
NaFe3+3Al6(BO3)3Si6O18(OH)4
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Quartz
Quartz (SiO2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Metamorphic Rock (Schist)
metamorphic
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral