Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Category
Mineral, Variety Of Quartz
Browse mineral, variety of quartz specimens identified by the Rock Identifier community.
Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)
Silicon Dioxide (SiO2)
sedimentary and metamorphic minerals
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
sedimentary
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Chert (and Limestone)
Chert (consisting of Microcrystalline Quartz, SiO2)
sedimentary
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Amazonite
Amazonite (KAlSi3O8); a green variety of Microcline feldspar
mineral
Jasper Geode
Silicon Dioxide (SiO2) with impurities
sedimentary
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Orthoclase Feldspar (Sunstone variety)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions
sedimentary
Yellow Jasper (Chert)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Granite
Granite (Silicic Plutonic Rock)
igneous
Yellow Jasper
Microcrystalline Quartz with Iron Oxide (SiO2)
sedimentary
Chert (and Chert Geode)
Silicon Dioxide (SiO2)
sedimentary
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Orthoclase Feldspar
Orthoclase (KAlSi₃O₈)
mineral
Blue Lace Agate (Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Banded Agate (specifically Sardonyx or Black Agate variety)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Jasper
Silicon Dioxide (SiO2)
Mineral
Green Jasper with Agate Banding
Silicon Dioxide (SiO2) with impurities of ferrous silicate or chlorite
sedimentary (chemical/biological origin)
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Granite (Light-colored quartz/feldspar variety)
Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Smoky/Milky variety with matrix)
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Chert (Yellow variety / Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper (with Quartz inclusions)
Silicon Dioxide (SiO2)
sedimentary (physico-chemical)