Richmond, Berkshire Co., Massachusetts (TYPE LOCALITY)
Small Cabinet, 7.1 x 6.6 x 2.6 cm
Ex. Philadelphia Academy of Natural Sciences
TYPE LOCALITY - Gibbsite is an interesting aluminum hydroxide with very little heft to it, that otherwise tends to look like heavy smithsonite or hemimorphite at first glance. This is a large, showy specimen of gibbsite from the TYPE LOCALITY. According to, this mineral was: named after Colonel George Gibbs (1777-1834), original owner of the Gibbs mineral collection acquired by Yale University early in the nineteenth century.