Amethyst
Amethyst (Quartz variety), Silicon Dioxide (SiO2)
mineral
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Graphic Granite
Graphic Granite (Granite Pegmatite)
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Azurite
Azurite (Cu3(CO3)2(OH)2)
mineral
Kunzite (Pink Spodumene)
Spodumene, LiAl(SiO3)2
mineral
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chinese Writing Stone
Porphyritic Basalt or Porphyritic Andesite with Feldspar phenocrysts (SiO2-rich Silicates)
igneous
Granitic Pegmatite with Schorl
Granitic Pegmatite (NaAlSi3O8, KAlSi3O8, SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
sedimentary
Amazonite
Amazonite (KAlSi3O8, a variety of Microcline)
mineral
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Garnet-Bearing Schist
Almandine Garnet Micaceous Schist
metamorphic
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Chert (vuggy variety)
Microcrystalline silica (SiO2)
sedimentary
Labradorite
Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Red Jasper (Heliotrope family variant)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Rhyolitic Matrix
igneous
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Carnelian Agate
Carnelian (Silicon Dioxide: SiO2) with iron oxide impurities
mineral
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Turritella Agate (Elimia Agate)
Silicified Elimia tenera (formerly misidentified as Turritella)
sedimentary (silicified fossiliferous chalcedony)
Gold Nugget
Native Gold (Au)
Mineral
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
Mineral variant
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Amethyst (as a jewelry accent)
Amethyst (Silicon Dioxide SiO2 with Iron impurities)
mineral