Browsing by Subject "hypergene zone"

Now showing 1 - 2 of 2

Access status: Restricted ,
Charakterystyka mineralogiczna arsenianów żelaza z Rędzin na Dolnym Śląsku
(Data obrony: 2014-12-01) Szot, Patrycja
Wydział Geologii, Geofizyki i Ochrony Środowiska
In the Rędziny (Lower Silesia), in the dolomitic marble quarry is very abundant, dispersed hypergenic zone, rich in rare secondary minerals. This zone was formed by the effect of weathering processes, at the expense of polymetallic primary mineralization. This work focuses on the mineralogical characteristics of secondary iron arsenates present in the fragment of hypergene zone. Phase identification was made by XRD, SEM-EDS and WDS. In the Rędziny recognized several iron arsenates: pharmacosiderite and Ba - pharmacosiderite, scorodite, very rare yukonite, Bi-yukonite and not defined Ca-Fe arsenates. Iron arsenates are one of the last phases formed in the oxidation zone in the Rędziny.
Access status: Restricted ,
Warunki powstawania roztworów stałych na przykładzie arsenianów i wanadanów z Rudaw Janowickich
(Data obrony: 2014-12-01) Białek, Jakub
Wydział Geologii, Geofizyki i Ochrony Środowiska
In this thesis analyses of solid solutions was made on the example of minerals from adelite-descloizite group recognized in Rędziny. Phases identification was made by XRD, SEM-BSE and WDS. Results of analyses showing presence of isomorphic solid solutions beetwen links of adeleit-descloizyte group. Studies confirmed substitutions both – in cations: Cu2+ - Zn2+, Ca2+ - Pb2+ and anion groups: [AsO4]3- - [VO4]3-. Explicit preferences in substitutions of specific ions was observed. Contents of lead in vanadates samples was much bigger than calcium in same position (mottramite), while arsenates showed varieties both – lead (duftite) and calcium (conichalcite). The most common phases, which are middle links in isomorphic series of adelite and descloizite group, was: arsenic mottramite, calcic-zinc vanadic duftite and lead-zinc conichalcite.