Moonstone
Orthoclase Feldspar (specifically showing adularescence)
Mineral
Category
Mineral (Specifically A Cryptocrystalline Variety Of Quartz)
Browse mineral (specifically a cryptocrystalline variety of quartz) specimens identified by the Rock Identifier community.
Learn about Mineral (Specifically A Cryptocrystalline Variety Of Quartz) in the encyclopedia
View all →
Tumbled yellow chalcedony (likely yellow jasper or quartz)
Microcrystalline quartz, SiO₂; probable chalcedony/jasper variety
mineral
Agate Slab
Chalcedony (SiO2)
mineral
Chalcedony (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Tumbled jasper (likely brecciated or red jasper)
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Tourmalinated Quartz
Silicon dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled chalcedony or agate pebble
Microcrystalline quartz (SiO₂), likely chalcedony with possible iron-oxide inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper (Skull Carving)
Jasper, a cryptocrystalline variety of Quartz (SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Chrysoprase
Silicon dioxide with nickel impurities (SiO2 + Ni)
mineral
Chert (or Dark Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Banded Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Chert (specifically Flint or Jasperoid)
Silicon Dioxide (SiO2)
sedimentary
Fluorite (specifically Blue John or Banded Fluorite)
Calcium Fluoride (CaF2)
mineral
Polished red jasper (likely brecciated or orbicular jasper)
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)
Milky quartz pebble
Quartz (SiO₂), cryptocrystalline to coarse microcrystalline variety
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Chert (Flint) River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Microcrystalline quartz (SiO2)
sedimentary
Rough Garnet in Matrix
Almandine Garnet (Fe3Al2Si3O12)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Hematoid Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Polished brown-and-cream jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Chalcedony (SiO2 with iron oxide inclusions)
mineral
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Polished red jasper (likely brecciated or orbicular jasper)
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Agate (within host rock)
Agate (Quartz variety SiO2)
mineral
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic