Amethyst
Silicon Dioxide (SiO2) with iron impurities
Category
Browse organic gemstone (not a rock) specimens identified by the Rock Identifier community.
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
Yellow Aventurine
Silicon Dioxide (SiO2) with inclusion of Mica
Petrified Wood
Silicified Wood (SiO2)
Yellow Jasper
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Amethyst
SiO2 (Amethyst is a variety of Quartz)
Granite
Granite (a common name for a felsic intrusive igneous rock)
Moonstone (Feldspar)
Orthoclase/Albite ((K,Na)AlSi3O8)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
Red Jasper
Jasper (Silicon Dioxide) - SiO2
Carnelian
Carnelian (Microcrystalline Quartz, SiO2)
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
Quartzite
Quartzite
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Jasper (Tumbled)
Silicon Dioxide (SiO₂)
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
Amethyst (Quartz Variety)
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
Carnelian (Agate/Chalcedony)
Silicon Dioxide (SiO2)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Carnelian
SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony
Blue Sodalite (Tumbled)
Sodalite (Na8(Al6Si6O24)Cl2)
Citrine
Silicon Dioxide (SiO2)
Amazonite
K(AlSi3O8) - Lead-bearing Microcline (Tectosilicate)
Emerald
Beryl (Be3Al2Si6O18) with trace amounts of Chromium and/or Vanadium
Blue Zircon
Zirconium Silicate (ZrSiO4)
Smoky Quartz
SiO2 (Silicon Dioxide)
Blue Kyanite
Kyanite (Al2SiO5)
Jasper (Red Jasper)
Silicon Dioxide (SiO2) with Hematite inclusions
Amber
Succinite (fossilized resin)
Amber
Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)
Amber
Succinite (with empirical formula approximately C10H16O)
Amazonite
Potassium feldspar (Microcline) - K(AlSi3O8)
Amazonite (Amazon Stone)
Tectosilicate Microcline (KAlSi3O8)
Zircon
Zirconium Silicate (ZrSiO₄)
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
Anthracite Coal
Anthracite