Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Carnelian
Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)
Mineral (variety of Chalcedony)
Banded Black Onyx (Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Chert (Chalcedony/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2) with cryptocrystalline structure
mineral
Botryoidal Chalcedony (likely Chert or Agatized Coral)
Silicon Dioxide (SiO2)
mineral
River Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Chalcedony/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties: Flint or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Geode (Quartz chalcedony variety)
SiO2 (Silicon Dioxide)
sedimentary
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (likely Chalcedony or Quartzite)
Silicon Dioxide (SiO2)
mineral
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
sedimentary (base), then artificial
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Chrysoprase
Chalcedony (cryptocrystalline silica containing nickel); Chemical Formula: SiO2 with Ni impurities
mineral
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Botryoidal Chalcedony (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Carnelian (Red Agate/Chalcedony)
Cryptocrystalline Quartz (SiO2) with Hematite impurities
mineral
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Flint or Chalcedony nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Chalcedony and Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Chalcedony/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Chalcedony or Flint variation)
Microcrystalline Quartz (SiO2)
sedimentary
Botryoidal Chalcedony (Desert Rose / Agate)
Silicon Dioxide (SiO₂)
Mineral variant
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary (microcrystalline silicate)
Jasper with Hematite (Red Jasper)
Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)
sedimentary (physico-chemical precipitate)