Search results for "Anglesite"
showing 3 items of 3 documents
PETTERDITE, THE Cr-DOMINANT ANALOGUE OF DUNDASITE, A NEW MINERAL SPECIES FROM DUNDAS, TASMANIA, AUSTRALIA AND CALLENBERG, SAXONY, GERMANY
2000
Petterdite is a newly discovered hydrated lead chromium hydroxyl carbonate, the Cr 3+ -dominant analogue of dundasite, with a formula PbCr 2 (CO 3 ) 2 (OH) 4 ·H 2 O. The type locality is the Red Lead mine, on the Zeehan–Dundas mining field in northwestern Tasmania, Australia. The mineral also occurs in small amounts at the Callenberg nickel deposit, Saxony, Germany. Petterdite forms thin crusts made up of tiny platy crystals up to about 15 μm across, associated with crocoite and anglesite at the type locality, and with crocoite, cerussite, bindheimite, pyromorphite, and relict galena at Callenberg. The petterdite crusts are pale greyish to pinkish violet and non-fluorescent; they have an ea…
"One-touch" voltammetry of microparticles for the identification of corrosion products in archaeological lead
2011
Voltammetry of microparticles is applied to the identification of lead corrosion products by means of an essentially non-invasive 'one-touch' technique based on the use of graphite pencil. This methodology permits the mechanical attachment of few nanograms of sample from the surface of lead archaeological artefacts to a paraffin-impregnated graphite electrode, which, upon immersion in aqueous electrolytes, provides distinctive voltammetric responses for litharge and cotunnite- anglesite-, cerusite-based corrosion products. The reported method is applied to the identification of corrosion products in archaeological lead pieces from different Iberian sites in Valencia (Spain). © 2011 WILEY-VC…
Dense Post-Barite-type Polymorph of PbSO4 Anglesite at High Pressures
2019
Synchrotron X-ray diffraction measurements on lead sulfate have been performed up to 67 GPa using He as pressure transmitting medium. Experiments reveal the existence of a reversible pressure-induced phase transition from the initial Pnma barite-type to the P212121 post-barite-type structure at pressures above 27 GPa. This phase transition involves a volume collapse of 2.4% and requires a considerable pressure overshoot (large pressure range with coexistence of phases) to overcome the large kinetic barrier of the transition. DFT calculations confirm the experimental observations and support the hypothesis that post-barite-type phase is the thermodynamically stable high-pressure structure fo…