Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Category
Sedimentary And Igneous
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Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Gneiss (with Granite/Pegmatite Vein)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss)
metamorphic
Quartz Pebble (on Granite)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Raw Agate (Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Banded Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Garnet-Bearing Gneiss
Garnetiferous Feldspathic Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Banded Agate
Chalcedony (SiO2) with impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite (on a metal substrate)
Iron Sulfide (FeS2)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Granitoid Gneiss with Feldspar Vein
Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Greenschist
Greenschist (Chlorite-Epidote-Actinolite Schist)
metamorphic
Banded Gneiss with Quartz Vein
Foliated Metamorphic Rock (Gneiss)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Amethyst and Hematite Bracelet
Amethyst (SiO2) and Hematite (Fe2O3)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Agate (specifically a Blue Agate Geode Slice)
Chalcedony (cryptocrystalline variety of Quartz); SiO2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral