Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Metamorphic
Browse sedimentary or metamorphic specimens identified by the Rock Identifier community.
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Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal Fragments)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Hematite / Jasper
Iron(III) oxide (Fe2O3) in Quartz (SiO2)
mineral / sedimentary
Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Tiger's Eye (Oeil de Tigre)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granitic Gneiss
Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Gneiss with Quartz Vein
Gneiss (containing SiO2 vein)
metamorphic
Gneiss
Gneiss
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Quartz (pebble)
Quartz (SiO₂)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenschist
Greenschist (Chlorite Schist)
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Cloudy Variety)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral