Fulgurite
Fulgurite (Lechatelierite), amorphous SiO2
metamorphic
Category
Metamorphic Rock (Formed From A Fibrous Crocidolite Asbestos)
Browse metamorphic rock (formed from a fibrous crocidolite asbestos) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (SiO2)
metamorphic
Black Star Diopside
Diopside (CaMgSi2O6) with asterism
Mineral
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
metamorphic (Lapis) and sedimentary/igneous assoc. (Moss Agate)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8
Mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Lapis Lazuli
Lapis Lazuli (Rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, Calcite, and Pyrite)
metamorphic
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)
metamorphic
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Unknown Rock Specimen
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Gold Ore
Native Gold (Au) in Matrix
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Greenschist
Greenschist (comprising Actinolite, Chlorite, and Epidote)
metamorphic
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)
Mineral
Quartz (milky quartz variety)
Quartz (SiO₂)
Mineral
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Quartzite
Quartzite (Primary mineral: SiO2)
Metamorphic
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
River Pebble (Gneiss or Quartzite variant)
Course-grained Metamorphic Rock (likely SiO2 dominant)
metamorphic
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
sedimentary or metamorphic
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral