Pasminco needs Century zinc ore, which can be produced without creating the toxic waste jarosite, to meet stringent environmental standards set by the Dutch government.
22.
Minerals formed by alteration processes include alunite, calcite, cristobalite, illite, jarosite, kaolinite, pyrophyllite, quartz, smectite, sulfur and tridymite.
23.
On Earth, such minerals would have formed in water and the presence of jarosite suggests an acid-rich lake or hot springs environment, scientists said.
24.
Jarosite is often produced as a byproduct during the purification and refining of zinc and is also commonly associated with acid mine drainage and acid sulfate soil environments.
25.
This indicates that there is a wide miscibility gap between the two end members, and it is doubtful whether a complete series exists between jarosite and natrojarosite.
26.
In one of the side chambers, the robot discovered strange Yellow spheres of Teotihuacan made of a core of clay covered in Jarosite formed by oxidation of pyrite.
27.
The moist air speeded the reaction and drew the acid to the surface and precipitated the streaks of sulfate salts _ gypsum, and the iron sulfates jarosite and melanterite.
28.
Although originally defined as a single mineral, limonite is now recognized as a mixture of related hydrated iron oxide minerals, among them goethite, akaganeite, lepidocrocite, and jarosite.
29.
There is also iron in the leach product from the strong acid leach, which is removed in an intermediate step, in the form of goethite, jarosite, and haematite.
30.
Pasminco requires the Century ore, which doesn't produce the residue jarosite from the treatment process, to satisfy the Dutch Government's environmental standards for the Budel zinc smelter.
