A very well formed specimen of blocky anglesite from the Bunker Hill Mine. Anglesites from this location are among the US's best, with the only real competition coming from mines in Arizona and Masachusstes, both of which stopped producing specimens decades before Bunker Hill (and Bunker Hill closed in 1988, though by that time the anglesites were not being found).
This piece comes with an old collector label attributing it to a 1980 purchase from Art Cooper, the predominant supplier of Bunker Hill specimens at the time. Classic and rare material.