Whilst detaching a small crystal of leadhillite for examination with the polariseope, from a specimen brought from the Leadhills, Lanarkshire, which came into my possession some years ago, I observed one side of the mass to be more or less encrusted with a thin drusy coating, which, from its hardness and streak, I was led to suspect might be either the above species, or Laxmannite, described in 1868 by Nordenskiöld in the Journ. f. prakt, chem. of that year.

The bulk of the specimen consists of massive greenish pyromorphito mingled with cerussite, upon this occurs the vauquelinite. The remaining minerals are lanarkite, leadhillite, caledonite in tufts of minute acicular crystals, massive black eerussite and quartz.