Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)
Browse sedimentary rock (technically a microcrystalline quartz mineral aggregate) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate) in the encyclopedia
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Rhyolite (Leopard Skin Jasper)
Rhyolite (Silicon Dioxide with impurities)
igneous
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (SiO2)
igneous
Tree Agate
Silicon Dioxide (SiO2) with dendritic inclusions
mineral
Chert Pebble (with Quartz Vein)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled blue jasper or blue-dyed jasper
Microcrystalline quartz (chalcedony), SiO₂; blue coloration may be natural or dye-enhanced
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Grey Chert River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Chalcedony
Quartz (Silicon Dioxide - SiO2)
mineral
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled carnelian (likely)
Carnelian, a chalcedony variety of microcrystalline quartz (SiO₂), colored mainly by iron oxides
gemstone
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (potentially Flint or Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Red jasper pebble
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Granite pebble
Granite, typically quartz–feldspar–mica aggregate
igneous
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Quartzite Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Bauxite
Aluminum ore (mixture of gibbsite Al(OH)3, boehmite γ-AlO(OH), and diaspore α-AlO(OH))
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Polished brecciated jasper (likely ocean jasper or orbicular jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
metamorphic
Chert (Flint/Novaculite)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Black onyx or black agate cabochon
Cryptocrystalline chalcedony, SiO₂; likely black chalcedony/onyx, though dyed material is possible
gemstone
Pink chalcedony / quartz fragment (probable)
Microcrystalline quartz, SiO₂ (likely iron-stained chalcedony or quartzite)
mineral
Chert (likely flint-bearing chert)
Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)
sedimentary
Chert (or Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert (varietal: Flint Pitted Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary