Banded Agate (with Quartz Geode Center)
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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Tumbled Carnelian
Silicon Dioxide (Variety of Chalcedony), SiO2
gemstone
Chalcedony (Blue/Grey Lace Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper-like Silicate)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Milky Quartz Nodule / Geode precursor
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Carnelian Agate Nodule
Chalcedony (SiO2) with Iron Oxide inclusions
sedimentary
Quartzite / Quartz Geodeoid Nodules
Silicon Dioxide (SiO2)
metamorphic
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary
Limonite (Ironstone)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
mineral
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-veined Sandstone Pebble
Quartzose Sandstone with Quartz Veinlets
sedimentary
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Agate (or Chalcedony)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Rhodochrosite with Quartz
Manganese Carbonate (MnCO3) with Silicon Dioxide (SiO2)
mineral
Limonite Geode / Ironstone Concretion with Quartz
Limonite with Quartz (FeO(OH)·nH2O + SiO2)
sedimentary
Jasper / Chert (Iron-stained Quartz)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
sedimentary
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Basalt with Jasper Veining
Basaltic Rock with Cryptocrystalline Quartz (SiO2)
igneous
Sandstone
Arenite (SiO2 secondary)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral