Fuchsite Quartzite (Green Aventurine in raw form)
Metamorphic Quartzite (SiO2) with Mariposite/Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Category
Sedimentary Rock (Technically Chert, A Microcrystalline Quartz)
Browse sedimentary rock (technically chert, a microcrystalline quartz) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Technically Chert, A Microcrystalline Quartz) in the encyclopedia
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Shale
Lutaceous Sedimentary Rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Orange Quartzite (Tumbled Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Banded Jasper
Silicon Dioxide (SiO2)
Mineral/Sedimentary Rock (as a cryptocrystalline variety of quartz)
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Bumblebee Jasper (technically Bumblebee Stone)
Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)
sedimentary (volcanic)
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Banded iron formation (BIF) / Chert
Banded Iron Formation (BIF), predominantly Microcrystalline Quartz (SiO2) and Iron Oxides (Fe2O3)
sedimentary
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Chert (Chert/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Chalcedony (Yellow Jasper or Agate)
Microcrystalline Quartz (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (with Limestone matrix)
Chert (Silica: SiO2)
sedimentary
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Banded Agate (likely Carnelian Agate or Sardonyx)
Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.
Sedimentary Rock (technically a variety of Chalcedony)
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert)
sedimentary
Banded Iron Formation (BIF)
Magnetite-Hematite Chert (Banded Iron Formation)
sedimentary
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Dyed Agate
SiO2 (Silicon Dioxide)
mineral
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Quartz
Silicon Dioxide (SiO2)
mineral
Coarse Sandstone Pebble
Clastic Sedimentary Rock (Sandstone)
sedimentary
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Quartz
Silicon dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary