Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
sedimentary
Category
Metal (Elemental Mineral)
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Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Rough Emerald Crystals
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartz Vein in Schist / Gneiss
Silicon Dioxide (SiO2) in Metamorphic Matrix
igneous
Gossan (Iron Hat)
Limonitic Gossan (Fe2O3·nH2O)
sedimentary
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
Gossan
Ferruginous gossan (Iron-rich capping)
sedimentary
Eudialyte
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
metamorphic
Gold Ore (in Quartz/Pyrite)
Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)
mineral
Cubic Zirconia (as used in jewelry setting)
Zirconium dioxide (ZrO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic
Gold Nugget
Gold (Au)
mineral
Aura Quartz (specifically Titanium Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)
mineral
Quartzite pebble
Quartzite (SiO2) with iron oxide staining
metamorphic
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Pyrite in Matrix with Copper Alterations
Iron Sulfide (FeS2) with secondary Copper carbonates/sulfides
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Aura Quartz (Titanium or Angel Aura coated)
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Opalite
Man-made opalized glass
mineral
Gold-bearing Quartz
Auriferous Quartz (SiO2 with Native Gold inclusion)
mineral
Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic