Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
sedimentary
Category
Organic Gemstone (Not A Rock)
Browse organic gemstone (not a rock) specimens identified by the Rock Identifier community.
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Ethiopian Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Chert (specifically Red Chert/Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Peridotite (Olivine)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Sunstone (Orthoclase Feldspar variant)
Orthoclase (KAlSi3O8) with inclusions
mineral
Limonite with Opal infusion
FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint Nodules)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Rhyolite
Rhyolite (felsic volcanic rock)
igneous
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Kimberlite
Kimberlite
igneous
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Heliotrope (Bloodstone)
Silicon dioxide (SiO2) with inclusions
mineral
Jasper pebble
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary (secondary classification: cryptocrystalline quartz)
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Black Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Quartz with Iron Oxide Monzonite or Sandstone contact
Quartz (SiO2) with Limonite/Hematite staining
mineral
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Carnelian (SiO2 with iron oxide impurities)
mineral
Red Jasper (beads)
SiO₂ (Silicon Dioxide)
Mineral, variety of chalcedony (microcrystalline quartz)
Amethyst (as a jewelry accent)
Amethyst (Silicon Dioxide SiO2 with Iron impurities)
mineral
Red Jasper
Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)
sedimentary
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral