Sandstone
Arenite (SiO2 based)
sedimentary
Category
Man Made Object (Metal Alloy)
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Quartzite
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Fluorite (Purple Octahedron)
Calcium Fluoride (CaF2)
Mineral
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Gold in Quartz
Gold (Au) in Quartz (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Limonite (with goethite)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of mineral group (Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Ironstone Concretion (Coprolite-like)
Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))
sedimentary
Galena
Lead(II) sulfide (PbS)
mineral
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Mixed Gemstone Beaded Jewelry
Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)
Mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
Basalt with Quartz Veins
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous)
igneous
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS)
mineral
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Weathered porphyritic basalt
Basalt, likely plagioclase-phyric basalt; primarily a fine-grained aggregate of plagioclase feldspar, clinopyroxene, and possibly olivine or iron-titanium oxides
igneous
Native Gold (in the form of jewelry)
Gold (Au)
mineral
Polished septarian nodule
Septarian concretion; calcite/aragonite and barite-filled fractures in a carbonate-rich mudstone, commonly with pyrite
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)
mineral
Gold and Diamond
Native Gold (Au) and Diamond (C)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral