Size 46 x 30 x 20 mm -weight 33 grams An excellent specimen of Gibbsite and Blue Allophane in bright colors 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.