Aluminum History: Why It Was Once More Valuable Than Gold
Aluminum was costlier than gold before 1886 because no efficient extraction existed. The Hall-Héroult electrolysis process crashed prices by 90%+. The Washington Monument's aluminum cap marks the transition.
Before 1886, aluminum was more valuable than gold despite being the most abundant metal in Earth's crust. The reason: aluminum is tightly bound in bauxite ore as aluminum oxide (Al₂O₃), and no efficient extraction method existed. Early production required reducing aluminum chloride with sodium metal — an expensive, small-batch process. Napoleon III reportedly served honored guests on aluminum plates while lesser guests used gold. The Hall-Héroult process (1886): Charles Martin Hall (USA) and Paul Héroult (France) independently discovered that dissolving alumina in molten cryolite and applying electrolysis could extract aluminum efficiently. Both were 22 years old at the time of their discoveries. Impact: The price of aluminum crashed from approximately $12 per pound (1880s — equivalent to hundreds of dollars today) to under $1 per pound within a decade. The Washington Monument's aluminum cap, installed in 1884 at the apex as a prestige material, became an ironic artifact of aluminum's brief era as a precious metal.