Gibbsite

Unknown Owner

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This was a onetime find about 6 years ago, where one room at Tucson had some flats of this rare material that was at first (and still often is...) mistaken for hemimorphite but is instead this rare aluminum hydroxide species. You can tell actually, just by the heft which is exceedingly lightweight! But nobody suspected any such mineral and so there they were, sold as hemimorphite in the beginning. Now, they are impossible to get - I have seen only one other for sale in the last few years. I regard these Chinese specimens as best-of-species, at least in terms of beauty and color.