Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Category
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Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (SiO2 equivalent)
metamorphic
Moss Agate / Carnelian Agate
Silicon Dioxide (SiO2) with iron and manganese inclusions
mineral
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon dioxide with iron impurities (SiO2)
mineral
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Amethyst
Quartz (SiO2 with Iron impurities)
mineral
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)
Amethyst Geode
Silicon Dioxide (SiO2) with trace Iron (Fe3+) impurities
mineral
Wonderstone (Liesegang Sandstone)
Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))
sedimentary
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Agate (Dyed Blue)
SiO2 (Silicon Dioxide)
Mineral (Chalcedony/Quartz variety)
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Rough Emerald Crystals
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Fire Quartz (Hematoid Quartz)
Quartz with Hematite inclusions (SiO2 + Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Rough Garnet in Matrix
Almandine Garnet (Fe3Al2Si3O12)
mineral
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Mosasaurus)
fossil
Green Fluorite (Beaded)
Fluorite (Calcium Fluoride, CaF2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Limonite (Limonitic Sandstone)
Hydrated Iron(III) Oxide-Hydroxide ($FeO(OH)·nH_2O$)
sedimentary
Limonite with Goethite
Iron Hydroxide Mixture (FeO(OH)·nH2O)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
gemstone
Fire Quartz (Hematoid Quartz)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Dalmatian Jasper / Feldspathic Igneous Rock
igneous
Limonite
Limonite (FeO(OH)·nH2O)
mineral
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Limonite
Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)
mineral
Limonite with Ironstone
Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral