The group includes baryte, celestine, anglesite
, and anhydrite.
Galena, Cerrusite and Anglesite
are the three most important ores that are mined.
(1) Low-temperature sulfur incrustations from Ebeko volcano contain appreciable amounts of trace elements stored in rock particles, metal sulfides (e.g., argentite ([Ag.sub.2]S), covellite (CuS), cadmoindite (Cd[In.sub.2][S.sub.4]), famatinite ([Cu.sub.3]Sb[S.sub.4])), chlorides (cotunnite (Pb[Cl.sub.2])), sulfates (anhydrite (CaS[O.sub.4]), alunite [(K[Al.sub.3](S[O.sub.4]).sub.2][(OH).sub.6]), anglesite
(PbS[O.sub.4]), barite (BaS[O.sub.4])), and tungstates (scheelite (CaW[O.sub.4])).
The LCMT was the residual of dressing Pb crude ore from the Bo Ngam mine (around 10 km from the facility) consisting of galena (PbS), cerrusite (PbC[O.sub.3]), and some anglesite
(PbS[O.sub.4]) in limestone, clay, and quartz matrices.
Galena generally oxidizes to cerussite (PbC[O.sub.3]) and anglesite
Mineralization consists of sediment-hosted zones of secondary lead carbonate (cerrusite) and sulphate (anglesite
) in deposits that occur on subtle topographic highs and are fairly flat-lying.
"It emerged that the sulphate anions had found a suitable reaction partner in lead ions from the varnish and had formed anglesite
," explains DESY scientist Gerald Falkenberg.
(PbSO4) is an opaque compound that was found nearly everywhere throughout the varnish.
They found that cadmium ions from the oil paint had combined with bits of the varnish itself to make a compound called cadmium oxalate, while sulphate ions from the paint interacted with lead from the varnish to make a compound called anglesite
. Together, the cadmium oxalate and anglesite
account for the discoloration.
(2001) identified both PbS[O.sub.4] (anglesite
) and metallic Pb in soil from this site.
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.