Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Man Made Object (Simulant)
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Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Lake Superior Agate
Chalcedony (Silicon Dioxide, SiO2) with Iron impurities
mineral
Jadeite (Nephrite-Jadeite blend)
Jadeite (NaAlSi2O6)
metamorphic
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Hematite/Limonite cement
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Limestone
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone (with Chert/Quartzite)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 variety)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Geode Fragment with Iron Staining
Silicon Dioxide (SiO2)
mineral
Basalt River Pebble
Aphanitic Mafic Igneous Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Moqui Marble
Ironstone Concretion (Ferruginous sandstone)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Lepidodendron Fossil (Scale Tree)
Lepidodendron sp.
fossil
Scoria
Vesicular Basalt / Scoria
igneous
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz Mineral
Quartz (Silicon Dioxide, SiO2)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Quartz
Silicon Dioxide (SiO2)
mineral