Quartz (Chert/Chalcedony variant)
Silicon dioxide (SiO2)
mineral
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Quartz (Pinkish-Orange Variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Pegmatite with Quartz and Muscovite Mica
Granitic Pegmatite (KAl2(AlSi3O10)(OH)2 + SiO2)
igneous
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Ferric Iron Oxides
mineral
Citrine Quartz Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Fire Agate
Agate (Variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Mixed Agate and Lapis Lazuli Bracelet
Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
sedimentary and metamorphic
Mookaite Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Carnelian
Carnelian (Cryptocrystalline variety of Quartz, SiO2)
mineral
Chert (Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Crinoid Fossil Limestone
Crinoidal Limestone (Calcite / CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gray Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Blue Topaz
Al2SiO4(F,OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
sedimentary
Quartzite (Meta-sedimentary)
Quartzite (SiO2)
metamorphic
Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral