Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
Sandstone
Arenite (primarily SiO2, silica)
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Quartz (River Stone)
Silicon Dioxide (SiO2)
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide - SiO2)
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Chert (White Chert/Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
Banded Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Sandstone with Iron Oxide (Limonite/Hematite)
Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)
Jasper / Chert (River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Quartz
Silicon Dioxide (SiO₂)
Chert (Nodule)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Milky Quartz
Silicon dioxide (SiO2)
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
Clear Quartz
Silicon Dioxide (SiO2)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Chert (White/Gray variety)
Chert (SiO2)
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
Basalt with Jasper Veining
Basaltic Rock with Cryptocrystalline Quartz (SiO2)
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2)
Chert (Iron-Stained)
Microcrystalline Quartz (SiO2)
Tumbled Carnelian and Quartz Mix
Silicon Dioxide (SiO2) with iron oxide impurities
Smoky Quartz
Silicon Dioxide (SiO2)
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Gneiss
Gneiss
Pyrite in Matrix
Iron Sulfide (FeS2)
Jasper (brecciated or orbicular variety)
Silicon dioxide (SiO2) with iron oxide inclusions