Size 13,5 x 8 x 5 cm -weight 489 grams A monumental, museum-quality, and exceptionally rare crystalline specimen of Gibbsite from the world-renowned mines of Lavrio. This particular piece is a premier find for discerning collectors, as specimens of this specific form and size are no longer easily encountered in nature. Top-Quality Botryoidal Growth: The mineral’s surface is dominated by an impressive, relief-like spherical (botryoidal) structure with a distinct waxy to sub-vitreous luster—a feature showcased beautifully in macro close-ups. Captivating Color Palette: The Gibbsite displays a rare, vivid turquoise and powder-blue hue, resulting from the natural presence of copper ions during its formation. The blue-green crust creates a perfect aesthetic contrast with the scattered, tiny specks of deep-blue azurite, which appear "embedded" within the porous, dark matrix of the rock. The specimen rises in an imposing, triangular formation—ideal for display—while preserving the raw, natural beauty of the region’s secondary minerals. An authentic piece of the mining history of Lavrio, distinguished by its superior quality, aesthetic perfection, and rarity. From ''Hilarion'' Mine, Kamariza Mines, Agios Konstantinos, Lavrion Mining District, Lavreotiki, East Attica, Greece will be sent with a security number Gibbsite, also called hydrargillite, is an aluminum hydroxide mineral. It is one of the three main components of bauxite rock. It is, therefore, one of the most basic minerals of aluminum. Named by John Torrey in 1822 in honor of Colonel George Gibbs [January 7, 1777, Newport, RI - August 5, 1834, Sunswick Farms, NY], of Newport, Rhode Island, USA. Gibbs was a wealthy import merchant who was a geologist and mineralogist. He helped found early scientific societies for mineralogy and geology and wrote several scientific articles on geology, mineralogy, and agriculture. He amassed the finest mineral collection in the USA up to the 1810s and the collection was eventually purchased by Yale University where it was an excellent nucleus for its research and museum collection.