The Oxford English Dictionary even contains an entry for rock butter, "a mineral composed of alum combined with iron, which exudes as a soft butter-like paste from certain aluminiferous rocks.". From Wordnik.com. [Shea Butter and Other Nondairy Foolers] Reference
Maniquarez and the aluminiferous slates of Chaparuparu, the connexion between tertiary strata and bituminous clay seemed to me somewhat problematical. From Wordnik.com. [Travels to the Equinoctial Regions of America] Reference
During a second excursion to Maniquarez and the aluminiferous slates of Chaparuparu, the connexion between tertiary strata and bituminous clay seemed to me somewhat problematical. From Wordnik.com. [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3] Reference
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