Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Category
Mineral (Variant Of Quartz)
Browse mineral (variant of quartz) specimens identified by the Rock Identifier community.
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Basalt with Mineral Vein (Cobble)
Basalt (with likely Quartz/Calcite vein)
Igneous
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Blue Quartzite
Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite)
metamorphic
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Indigo Gabbro
Gabbro (composed of plagioclase feldspar, pyroxene, and olivine)
igneous
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Graphic Granite (Zebra Rock)
Pegmatitic Granite (composed of Quartz and K-Feldspar)
igneous
Granite (specifically Pink or Alkali Feldspar Granite)
Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Agate
Silicon Dioxide / Cryptocrystalline Quartz (SiO2)
mineral
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Red aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
metamorphic
Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)
Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)
igneous or sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Green Quartzite
Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite
metamorphic
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Mineral
Quartzite River Rock with Dendrites
Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions
metamorphic
Jasper (Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint) with Glauconite
Microcrystalline Quartz (SiO2)
sedimentary
Falcon's Eye (Blue Tiger's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Chalcedony
Silicon dioxide (SiO2) - Microcrystalline quartz
mineral
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Agate inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary