Blue Sapphire
Corundum (Al2O3)
mineral
Category
Igneous And Sedimentary Mixture
Browse igneous and sedimentary mixture specimens identified by the Rock Identifier community.
Gneiss
Gneiss
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Gneiss (High-Grade Metamorphic Rock)
Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Schist
Mica Schist (Variable chemistry, often rich in muscovite and biotite)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Gneiss
Gneiss
metamorphic
Carnelian
Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (Red Agate)
Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Epidote-bearing Granite (Unakite-like)
Epidotized Granite
igneous
Chalcedony (Blue/Grey Lace Agate)
Silicon Dioxide (SiO2)
mineral
Quartz River Cobble
Silicon Dioxide (SiO2)
mineral
Rhyolite
Rhyolite (Extrusive Igneous Rock)
igneous
Wonderstone
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
sedimentary
Blue Quartz
Quartz (Silicon Dioxide) with blue inclusions (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe2+3Al6Si6O18(BO3)3(OH)3OH
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (on Quartz/Sulfide matrix)
Iron Sulfide (FeS2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral