Common Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Category
Sedimentary And Igneous
Browse sedimentary and igneous specimens identified by the Rock Identifier community.
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Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Banded Metamorphic Rock
Gneiss or Schist
metamorphic
Fluorescent Calcite
Calcite (CaCO3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Agate
Chalcedony (SiO2) with impurities
sedimentary
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Quartz (Raw Specimen)
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Zoisite with Rubellite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende (Anyolite)
metamorphic
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral