- Calcite, Aragonite
- Small Cabinet, 9.2 x 7.1 x 3.0 cm
- Blue Goose Mine, Joplin Field, Tri-State District, Jasper Co., Missouri, USA
A unique, old-time calcite specimen from the Joplin Field of Missouri. This weirdly shaped, conical piece is called a "harlequin" or masked calcite. A glassy, translucent, amber calcite scalenohedron has an overgrowth crust of bone-white aragonite. The aragonite masks the calcite, just as a Harlequin, a comic character in pantomine, wears a mask. A very unusual specimen from a very uncommon mine - the Blue Goose, in this historic district. Ex. Norris, Steve Chamberlain and George Feist Collections.