Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
Hematite
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Quartz (Common Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy variety)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Galena
Lead Sulfide (PbS)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Diamond
Diamond (pure Carbon, C)
mineral
Bixbyite on Rhyolite
Bixbyite (Mn2+,Fe3+)2O3
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Amethyst
Quartz (Silicon Dioxide) with Ferric Iron impurities - SiO2
mineral
Rutilated Quartz (or Tourmalinated Quartz if inclusions are Tourmaline)
Silicon Dioxide (SiO2) with Rutile (TiO2) or Tourmaline inclusions
Mineral
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral
Amethyst
Amethyst is a variety of Quartz (SiO₂)
Mineral
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
igneous