A very large and heavy specimen containing a rich assemblage specimen of the Leadhills minerals, featuring what are surely very rich Lanarkite crystals (greenish blades, matching photos on MINDAT quite nicely) in a rich concentration. Also associated are other mienrals including, if I read them right, mimetite, pyromorphite, and malachite with leadhillite as well. The back is richly coated with a yellow mineral, perhaps mimetite. The piece is very rich in crystalline material in vugs throughout, some of which I am assuming is leadhillite and relatives - though I have not analyzed this, it should be noted, and it is offered "as is" with lanarkite being the major constituent of value and a certainty. The other species are a bonus!