Basalt with Quartz/Zeolite Inclusions
Porphyritic Basalt (SiO2 with Aluminosilicates)
igneous
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
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Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Ironstone (Limonite/Hematite concretion)
Ferruginous Siltstone / Goethite (FeO(OH))
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with Crocidolite or Magnesio-riebeckite inclusions
metamorphic
Agate (Water-Worn Pebble)
Silicon Dioxide (SiO2) - Chalcedony
mineral
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Orange Quartz (Tangerine Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Quartz
Quartz (SiO₂)
Mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Crazy Lace Agate
Chalcedony (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial colorants
mineral
Porphyritic Basalt (Amygdaloidal)
Porphyritic Mafic Volcanic Rock (Amygdaloidal Basalt)
igneous
Quartz (Milky or Common Quartz)
Silicon Dioxide (SiO2)
mineral
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Host Rock (clastic sediment)
Silicon Dioxide (SiO2) in matrix
sedimentary
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Green Aventurine
Aventurine (variety of Quartz - SiO2)
Mineral_Rock
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Banded Agate (Lake Superior Agate style)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Moss Agate
SiO2 (Silicon Dioxide) with dendritic inclusions
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Agate (Chalcedony Variation)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral