Lee, "Formation of leadhillite
and calcium lead silicate hydrate (C-Pb-S-H) in the solidification/stabilization of lead contaminants," Chemosphere, vol.
In particular, in the presence of PC and FA, Pb, if present at high concentrations, may form, depending on the pH value, hydroxide and silicate phases characterized by a low solubility such as leadhillite
(lead carbonate sulfate hydroxide, [Pb.sub.4]S[O.sub.4][(C[O.sub.3]).sub.2][(OH).sub.2]), lead carbonate hydroxide hydrate (3PbC[O.sub.3] x 2Pb[(OH).sub.2] x [H.sub.2]O) (Lee 2007) and lead silicate ([Pb.sub.2]Si[O.sub.4], [Pb.sub.3]Si[O.sub.5]) (Moon, Dermatas 2007) that reduce the permeability of the matrices and increase the setting times.
These included leadhillite
from Leadhills, Scotland in miniature sizes with crystals to 1 cm, and other one-of-a-kind classics such as liroconite from Cornwall.
These include arsentsumebite, tsumebite, corkite, fornacite, duftite, caledonite, kettnerite, linarite, leadhillite
, brochantite, mimetite, pyromorphite, vanadinite and wulfenite.
Other species for which the area was a renowned source of collector specimens include plumbogummite, linarite, hemimorphite, caledonite, leadhillite
, scheelite and apatite.
This appears to have come from one of the old specimens and was probably the material misidentified by Greg as "sulphate tri-carbonate" (a synonym of leadhillite
, another platy lead mineral).
He opens the drawers down in the basement and lets you select pretty much what you want: a Bisbee azurite rose, a wire silver from Norway, a leadhillite
from Missouri, crystallized coppers from Michigan.
The locality is well-known for fine examples of common secondary minerals such as cerussite, dioptase and wulfenite, and also for rarer species such as diaboleite, caledonite, bideauxite and leadhillite
which represent some of the finest known examples of their species.
1139 Lanarkite and Leadhillite
, Leadhills, Scotland, no.
Fine examples of cerussite, dioptase, malachite, azurite, wulfenite, smithsonite and vanadinite have been collected there, as well as some of the finest known examples of a number of rarer species such as boleite, diaboleite, caledonite, hydrocerussite, linarite, matlockite and leadhillite
Wayne and his collecting partners located the linarite/caledonite stope, the diaboleite stope, a 300-foot exposure of cerussite (reticulated and V-twins) and several wulfenite veins, but the leadhillite
(their principal target) proved to be inaccessible.
Paul Harter's leadhillite
from Tiger took the Bideaux Trophy for best Arizona specimen.