Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Category
Igneous, Sedimentary, And Metamorphic
Browse igneous, sedimentary, and metamorphic specimens identified by the Rock Identifier community.
Agate
Cryptocrystalline Quartz (SiO2)
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Marble
Recrystallized Calcite / Calcium Carbonate (CaCO3)
metamorphic
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Slate
Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Quartz (Silicon Dioxide) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Schorl (Black Tourmaline) in Quartz Matrix
Schorl: NaFe3Al6(BO3)3Si6O18(OH)4 (Complex Borosilicate)
mineral
Amethyst (Rose de France varieties or Amethystine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Jasper and Basalt (Mixed Breccia or Chert)
Silicon Dioxide (SiO2) with Ferromagnesian silicates
sedimentary and igneous (mixed)
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Pumice
Pumice (volcanic rock)
Igneous
Jasper (with orbicular/unakitoid tendencies)
Silicon Dioxide (SiO2) with iron and epidote inclusions
sedimentary (chemically precipitated) or metamorphic
Tourmaline (Schorl or Dravite) on Matrix
Complex Borosilicate - Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH,F)4
mineral
Aventurine (likely Green Aventurine)
Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)
Mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
Mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Purple Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2AlSi3O10(OH)2
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Schist
Schist (metamorphic rock)
metamorphic
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Cobaltoan Calcite / Pink Dolomite (Possible)
Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))
Mineral / Rock (depending on purity)
Rutilated Quartz
SiO2 (Quartz) with TiO2 (Rutile inclusions)
Mineral
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous