(PbSO4) is an opaque compound that was found nearly everywhere throughout the varnish.
It emerged that the sulphate anions had found a suitable reaction partner in lead ions from the varnish and had formed anglesite
," DESY scientist Gerald Falkenberg said.
Together, the cadmium oxalate and anglesite
account for the discoloration.
Within the oxidized zones, the primary sulfide minerals were commonly converted to limonite, pyrolusite, cerussite, anglesite
, argentojarosite and plumbojarosite (basic sulfates of Fe), and native silver, with traces of malachite and azurite.
Some of the highlights include: Parys Mountain,on Anglesey, was once the world's largest copper mine and contains a wide range of minerals including pyrite, galena and the rare anglesite
Parys Mountain on Anglesey was former the world's largest copper mine and contains a wide range of minerals including Pyrite, Galena and the rate Anglesite
Lead phases detected in lead paint include synthetic hydrocerussite, crocoite, anglesite
, phoenicochroite and possible plattnerite.
Ore minerals include gold, silver, chalcopyrite (CuFeS2), galena (PbS), bornite (CuFeS4), covellite (CuS), chalcocite (Cu2S), anglesite
(PbSO4), sphalerite (ZnS), argentite (Ag2S), cerussite (PbCO3) and smithsonite (ZnCO3).
These, first briefly described by Knopf (1914), included linarite, caledonite, anglesite
, wulfenite, hemimorphite and cerussite.
Test material Phase 1 2 3 4 5 6 7 8 Anglesite
-- 28 1 0.
Other minerals found there include the sulfide minerals chalcopyrite, galena, glaucodot, marcasite, pyrite and sphalerite, as well as anglesite
, barite, brochantite, "nail-head" calcite, devilline, dolomite, linarite, malachite, quartz, schulenbergite, serpierite, smolyaninovite and wroewolfeite.
Small, tabular anglesite
crystals on galena have been found, as well as rare sky-blue to sea-green aurichalcite sprays (Middle level), and nondescript coatings of green malachite and pale brown hemimorphite.