Boulangerie, named after the French mineralogist Boulanger, is a bluish- grey coloured lead ore. It contains 55 percent lead. It has a relative hardness of 2.5.
Related terms:
Boulangerie, named after the French mineralogist Boulanger, is a bluish- grey coloured lead ore. It contains 55 percent lead. It has a relative hardness of 2.5.
Related terms: