Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
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Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
mineral
Green Jasper / Bloodstone
SiO2 (Microcrystalline Quartz)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Tumbled blue-green chrysocolla (likely chrysocolla with quartz)
Chrysocolla, hydrated copper aluminum silicate; commonly intergrown with quartz, Cu₂H₂Si₂O₅(OH)₄
mineral
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Chert / Quartzite
Silicon Dioxide (SiO2)
sedimentary
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide with Hematite (SiO2 + Fe2O3)
sedimentary
Agate (Puddingstone style)
Silicon Dioxide (SiO2) with impurities
mineral
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Citrine or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Eye Agate / Chalcedony)
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Agate (Turtle Carving)
Agate (Cryptocrystalline variety of Silica, SiO2)
mineral
Chert (Flint / Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
White Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate (specifically Lake Superior Agate style or Banded Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz Geode with Iron Oxide
Silicon Dioxide (SiO2) with Hematite/Goethite coatings
mineral
Chert / Flint Arrowheads
Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
sedimentary
Chalcedony (Agate / Moss Agate)
Silicon Dioxide (SiO2)
mineral
Carnelian (Polished Agate/Jasper)
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chrysocolla (carved)
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
igneous
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
Mineral / Sedimentary setting
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Amygdaloidal Basalt with Agate/Zeolite Amygdules
Basalt (extrusive igneous rock) containing secondary mineral fillings
igneous
Quartz (Yellow/Citrine variety or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral