Serpentinite
Serpentinite (composed primarily of mineral group (Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Category
Metal (Elemental Mineral)
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Dark igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron disulfide (FeS2)
mineral
Granite / Pegmatite Pebble
Felsic intrusive igneous rock
igneous
Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Quartzite Cobble
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Opalite
Synthetic Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
gemstone
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gold in Quartz
Hydrothermal Quartz with Native Gold (SiO2 with Au)
mineral
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Gold
Native Gold (Au)
mineral
Cubic Zirconia (CZ)
Zirconium dioxide (ZrO2)
mineral
Red Cubic Zirconia (Simulated Garnet)
Zirconium Dioxide (ZrO2)
mineral
Aquamarine (Small Beads)
Beryl (Be3Al2Si6O18 with traces of iron)
gemstone
Diamond (in a metal ring setting)
Diamond (Pure Carbon, C)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Gossan (with secondary copper minerals)
Iron-rich oxidized rock cap (Limonite/Goethite with Malachite/Chrysocolla inclusions)
metamorphic
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Pyrite
Iron Sulfide (FeS2)
mineral
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2)
mineral
Gold-bearing quartz vein specimen
Native gold (Au) in quartz (SiO₂), likely with iron-oxide staining
mineral
Black Onyx
Cryptocrystalline Quartz (SiO2) with impurities
mineral
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Faceted Peach Morganite (Beryl)
Morganite (Be3Al2Si6O18 with trace Manganese)
mineral
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)