Green aventurine (likely)
Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite
mineral
Category
Man Made Byproduct (Non Geological)
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Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Blue faceted gemstones, likely blue sapphire
Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium
gemstone
Quartz
Silicon dioxide (SiO₂)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Green cabochon gemstone pendant
Indeterminate; likely dyed green turquoise, chrysoprase, or opaque beryl set with blue/clear accent stones
gemstone
Granite Pebble
Felsic intrusive igneous rock
igneous
Quartzite
Metamorphic Quartzite
metamorphic
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Gold
Native Gold (Au)
mineral
Obsidian
Obsidian (volcanic glass)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (variations include Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Conglomerate
Conglomerate / Lithic Wacke
sedimentary
Quartzite Pebble
Quartzite
metamorphic
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Pearl-embellished decorative cross
Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones
gemstone
Obsidian
Volcanic Glass (SiO2)
igneous
Black Obsidian
Amorphous volcanic glass (SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Black Obsidian
Volcanic Glass (70–75% SiO2 plus MgO, Fe3O4)
igneous