Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is A Microcrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is a microcrystalline quartz) specimens identified by the Rock Identifier community.
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (SiO2 with Fe2O3 inclusions)
sedimentary
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Agate
Cryptocrystalline Quartz (SiO2)
mineral
Agate (Chalcedony slice)
Cryptocrystalline Quartz (SiO2)
mineral
Blue Lace Agate
Agate (Variety of Chalcedony, SiO2)
sedimentary
Yellow Jade (Yellow Chalcedony/Quartz)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Tiger's Eye (a variety of Quartz, SiO₂)
Mineral (specifically a gemstone variety)
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety Carnelian (Chalcedony)
Mineral
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities
sedimentary
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuscite inclusions
mineral
Quartz (Smoky/Milky variety with inclusion)
Silicon Dioxide (SiO2)
mineral
Chert (Polished Gemstone / River Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Citrine
Quartz (SiO₂)
Mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Hydroxide inclusions
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Amethyst Geode (Thunderegg)
Silicon Dioxide (SiO2) - Quartz Variety: Amethyst
mineral
Green Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Quartz pebble)
Silicon dioxide (SiO2) - Microcrystalline Quartz
mineral
Milky Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky or Druzy variety)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (Quartzite)
metamorphic
Chert (Nodule)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper (River Polished)
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary/mineral
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Blue John Fluorite
Fluorite (Calcium Fluoride), CaF2
mineral
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Carnelian Agate
Silicon Dioxide (SiO2) - Carnelian variety of Chalcedony
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary