Mineral, Metal (Element)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst

Silicon dioxide (SiO2) with iron impurities

Man-made Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating/dye

Granite

Phaneritic Plutonic Igneous Rock (Rich in SiO2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Polished hematite bead (probable)

Hematite, Fe₂O₃

Likely iron-rich rock or metallic mineral fragment

Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Dyed Agate Slice

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Aventurine (Green)

Silicon Dioxide (Quartz variety) containing Fuchsite - SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Iron-rich meteorite candidate

Undetermined stony-iron or iron meteorite; possible weathered iron meteorite

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Smelter Slag

Anthropogenic Silicate Slag

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Granite

Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Slag

Ferrous slag (by-product of iron smelting)

Purple Lepidolite with Quartz

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Slag Glass

Vitreous Silicate Residue

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Gold

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Limonite/goethite-rich ironstone

Limonite (hydrated iron oxides, chiefly FeO(OH)·nH₂O), commonly mixed with goethite and hematite

Possible iron-rich concretion or weathered ironstone

Goethite/hematite-bearing limonite concretion (tentative)

Slag

Anthropogenic glassy silicate

Iron-stained quartz-rich rock, likely brecciated quartz vein

Quartz (SiO₂) with iron oxides/hydroxides, chiefly hematite and goethite; possibly limonite

Limonite (Ironstone)

Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Diamond ring

Diamond (crystalline carbon, C)

Diamond jewelry

Diamond (crystalline carbon, C)

Limonite with Quartz

FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Vesicular basalt (possible scoria)

Basaltic volcanic rock; chiefly plagioclase, pyroxene, and iron-rich minerals, with vesicles formed by trapped gas