Schist
Mica Schist (Complex Silicates)
metamorphic
Category
Industrial Byproduct (Anthropogenic Material)
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Diamond (or Simulant)
Carbon (C)
gemstone
Quartzite
Quartzite (SiO2)
metamorphic
Basalt River Pebble
Basalt (Mafic volcanic rock)
igneous
Blue Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
gemstone
Blue Sapphire (Raw)
Corundum (Al2O3)
mineral
Diamond (in Jewelry Setting)
Carbon (C)
gemstone
Mica Schist (with Garnet)
Garnet-Mica Schist
metamorphic
Jasper / Yellow Chalcedony Pebble
Silicon Dioxide (SiO2)
sedimentary
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony Geode / Agate Nodule
Cryptocrystalline Quartz (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) containing Iron Oxide inclusions
sedimentary
Diamond
Diamond (C)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
sedimentary
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
Mineral
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Agate
Agate (Microcrystalline Quartz, SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Quartz (specifically a water-worn river pebble)
Silicon Dioxide (SiO2)
Mineral
Pumice
Vesicular volcanic glass
igneous
Magnetite (or Magnetic Iron Ore)
Magnetite (Fe3O4)
mineral
Rough Sapphire
Corundum (Al2O3)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Aquamarine (Pale variety)
Beryl (Be3Al2Si6O18)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Pegmatite
Granitic Pegmatite
igneous
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Aragonite Star Cluster
Aragonite (Sputnik habit) - CaesarCO3
mineral
Parti Sapphire
Corundum (Al2O3)
mineral
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary