Description and analysis of a new Species of mineral, petterdite, A new oxychloride of lead

This apparently absolutely new chemical combination occurs in attached crystal groups in a quartz gangue containing disseminated pyrites, in the form of somewhat thin hexagonal plates, which are usually minute in size (about 5 millemetres in diameter), but occasionally reach 9 mm. dia., and, still more rarely, a larger size. Macles are not rare, irregularly attached and implanted on each other, and on the matrix