Green Aventurine
Silicon Dioxide (SiO2) with Fuscite inclusions
mineral
Category
Synthetic Or Natural Fiber
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Blue Agate (likely dyed)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Obsidian
Obsidian (Volcanic Glass) SiO2 (70% or more)
igneous
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Aura Quartz (Titanium or Angel Aura coated)
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Lignite (Brown Coal)
Lignite (C189H155O6N3S)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Smoky Quartz (with complementary stones in jewelry setting)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Chakra Stone Tower (Composite Multi-Mineral)
Crystalline Silicon Dioxide composite (SiO2) with various inclusions
mineral
Pink Tumbled Agate (Dyed)
Silicon Dioxide (SiO2) with artificial dyes
mineral
Amethyst (Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Glauconitic Sandstone
Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Shale
Lutaceous Rock (Sedimentary Mudrock)
sedimentary
Limonite/Ironstone
Limonite (Hydrous ferric oxides), FeO(OH)·nH2O
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
igneous
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Granite (Worn Pebble)
Granite
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rhodochrosite (Beads) and Citrine (Pendant)
Rhodochrosite (MnCO3) and Quartz variety Citrine (SiO2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
River Stone (Quartzite/Siltstone)
Quartzite (primarily SiO2)
metamorphic
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Siltstone or Limestone Beach Pebble
Siltstone / Micritic Limestone
sedimentary
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Limonite (Pseudomorph after Pyrite/Marcasite)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Orange Calcite / Quartzite with Iron Staining
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) with Iron Oxide impurities
mineral