Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Category
Igneous
Browse igneous specimens identified by the Rock Identifier community.
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Kfeldspar (Potassium Feldspar)
KAlSi3O8
mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Blue Topaz
Al2SiO4(F,OH)2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Lapis Lazuli
Lapis Lazuli (Rock composed mainly of lazurite, calcite, and pyrite)
gemstone
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Potassium Feldspar (Microcline / Orthoclase)
KAlSi3O8
mineral
Milky Quartz
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
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Hematite
Iron Oxide (Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Cryptocrystalline quartz, SiO2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz pebble / River stone
SiO2 (Silicon Dioxide)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Nuummite
Nuummite (mixture of anthophyllite and gedrite)
metamorphic
Marble
Metamorphosed Limestone / Calcite or Dolomite
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Quartz pebble with iron inclusion
Silicon Dioxide (SiO2)
mineral
Quartz / Feldspar Specimen
SiO2 (Quartz) / KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar Group)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
NaFe3+3Al6(BO3)3Si6O18(OH)4
mineral
Lapis Lazuli
Rock composed mainly of lazurite, calcite, and pyrite
gemstone
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Yellow Calcite
Calcium Carbonate, CaCO3
mineral