Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary And Igneous
Browse sedimentary and igneous specimens identified by the Rock Identifier community.
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Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Hematite
Iron Oxide (Fe2O3)
mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)
igneous
Polished orbicular stone, likely granite or diorite
Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite
igneous
Dalmatian Jasper
Dalmatian Stone (Aplite with Arfvedsonite)
igneous
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral
Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Natural freshwater pearls
Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Likely tumbled hematite or magnetite
Hematite (Fe₂O₃) or magnetite (Fe₃O₄)
mineral
Magnetite Ore
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Faceted Clear Quartz or Diamond Simulant
Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral