Algodonite Var. "Whitneyite"
Miniature, 4.8 x 3.1 x 2.8 cm
Calumet, Michigan, USA

According to, whitneyite is actually a synonym of algodonite, and not a distinct species, in which case the blue smudge is perhaps azurite, and the whole piece here is algodonite. (a nice massive sample of the material)