Gibbsite

Unknown Owner

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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 Mindat.org, 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.