Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Category
Metamorphic Rock
Browse metamorphic rock specimens identified by the Rock Identifier community.
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Biotite (Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Ruby Zoisite
Anyolite (Composition of Green Zoisite, Black Tschermakite, and Red Corundum)
metamorphic
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Amethyst Geode/Cluster
Quartz (SiO2) - variety Amethyst
Mineral
Pumice
Pumice (volcanic rock)
Igneous
Granite
Granite
Igneous
Sandstone (Greywacke)
Arenite / Wacke (Mainly SiO2 with various lithic fragments)
sedimentary
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Aquamarine
Beryl (Be₃Al₂Si‑₆O₁₈)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Dumortierite Quartz
Dumortierite (Al7BCuO15)
metamorphic
Rhodonite
Rhodonite (MnSiO3)
Mineral
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Greenschist
Greenschist (comprising Actinolite, Chlorite, and Epidote)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Adventurine (Green)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Mexican Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
mineral
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Schist (Micaceous)
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral