English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The crystal structures of an anthropogenic Sn2+ silicate, Sn6O4(SiO4), hexagonal, space group P63mc, a 7.3742(4), c 11.9598(10) Å, V 563.23(6) Å3, Z = 2, Dcalc 5.12 g/cm3, and an anthropogenic Sn2+ sulfate, Sn6O4(SO4)(OH)2, orthorhombic, space group Pbca, a 14.0071(8), b 12.5016(7), c 14.5030(9) Å, V 2539.6(3) Å3, Z = 8, Dcalc 4.74 g/cm3, were refi ned by full- matrix least-squares techniques on the basis of F2 to agreement indices R1 (Sn2+ silicate and Sn2+ sulfate) of 3.0 and 4.2%, calcu- lated for 704 and 3281 unique observed refl ections (|Fo| ≥ 4F), and wR2 of 5.5 and 11.0% for all data, respectively. Intensity data were collected at room temperature using MoK radiation and a CCD-based area detector. Both structures contain the (Sn68) cluster (: O2- or (OH)-), which has been found in several stannous compounds, and which can be derived from the structure of fl uorite. These two compounds occur with romarchite, SnO, and hydroromarchite, Sn3O2(OH)2, on pewter bowls that had become corroded in cold freshwater for approximately 160 years.

THE STRUCTURES OF TWO NOVEL Sn2+ OXYSALTS FOUND WITH ROMARCHITE AND HYDROROMARCHITE AS CORROSION PRODUCTS OF PEWTER ARTIFACTS