Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
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Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Carnelian Agate
Silicon dioxide (SiO2) with iron impurities
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Carnelian
Chalcedony (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Agate Geode
Cryptocrystalline Quartz (SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Green Onyx (Agate)
Silicon Dioxide (SiO2)
sedimentary
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Blue-and-white polished stone, likely dyed howlite or turquoise imitation
Probably dyed magnesite/howlite (CaCO₃), but the image is insufficient for confirmation
mineral
Agate Pebble (Desert Agate / Chalcedony Nodule)
Silicon Dioxide (SiO2)
mineral
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert (specifically Iron-stained River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Chert (with Quartz)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
Carnelian
Carnelian (Silicon Dioxide: SiO2 with Iron Oxide impurities)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Common Opal variant or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Ironstone Matrix with Jasper / Chert
Ferruginous Chert / Limonitic Jasper (SiO2 with Fe-oxides)
sedimentary
Red Jasper
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)
sedimentary
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
sedimentary
Limonite / Ironstone
FeO(OH)·nH2O
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Fancy Jasper
Silicon Dioxide (SiO₂)
sedimentary
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Chalcedony Pebble / Rough Agate
Silicon Dioxide (SiO2)
mineral
Bloodstone (Heliotrope)
SiO2 (Cryptocrystalline Quartz / Chalcedony)
mineral
Weathered jasper-rich ironstone
Brecciated jasper/chert with iron oxides and hydroxides (SiO₂ with hematite, goethite, and limonite)
sedimentary
Tumbled brown stone, likely jasper or iron-rich chert
Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert
sedimentary
Chalcedony (Common Opal variant or Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Formation
sedimentary
Blue Chalcedony (Moonstone-like / Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
gemstone
Banded Chert / Cryptocrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
sedimentary