BRE'ISLAKITE, noun A newly discovered Vesuvian mineral, resembling a brownish or reddish brown down, which lines the small bubbles found in the lava of Scalla, and is found in cavities of the lava of Olebano; names from Breislak, a celebrated Italian naturalist.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI