Antimony Oxychloride Research Articles

Antimony halides as solvents. Part VI. Some cryoscopic measurements in antimony trichloride

Some cryoscopic measurements are presented which confirm the applicability of the Beckmann technique. The technique is then used to study the solutes water and antimony oxychloride which appear to behave as normal solutes.

Onoratoite, a new antimony oxychloride, from Cetine di Cotorniano, Rosia (Siena, Italy)

SummaryOnoratoite, a new antimony oxychloride Sb8O11Cl2 from the antimony mines of Cetine di Cotorniano, Rosia (Siena, Italy), is triclinic with lattice constants a 18·92, b 4·03, c 10·31 Å, α ≃ γ ≃ 90°, β 110°. Density 5·3 meas., 5·49 calc. The needle-like crystals are elongated on [010] and show as prominent form {001}. Other forms present are {100}, {201}, {401}, {412}.The new mineral is optically biaxial negative, extinction angle small and variable from 0° to 14°. Orientation β:[100] ca. 8°; α:[001] ca. 12°; γ:[010] 0 to 14°. Refractive indices are 2·26 > γ > 2·23, 2·23 > β > 2·18. Birefringence γ-β 0·024 (meas.).The stability field of onoratoite has been investigated by systematic thermo-gravimetric and differential thermal analysis of antimony oxychlorides and by a direct study of equilibrium relationships in the system SbCl3-Sb2O3-HCl-H2O. The probable mechanism of formation of onoratoite is discussed.Onoratoite is named in honour of the Italian mineralogist Ettore Onorato.

Antimony 8-hydroxyquinolinates

Precipitation from homogeneous solution or by conventional means with 8-hydroxyquinoline in the presence of tartaric acid has been successfully employed for the determination of antimony. The complex produced corresponds to the formula SbOQ,2HQ. Antimony cannot be determined in the absence of tartaric acid, as the resulting compound SbQ3 is co-precipitated with antimony oxychloride. Thermo-gravimetric and spectroscopic studies were also carried out on the precipitates obtained.

Richmondite, a Discredited Mineral Species

EIGHTY years ago William Skey1,2 analysed and described a mineral from Richmond Hill in northwest Nelson, New Zealand, naming it richmondite . His analysis of this material, after deducting 15.4 per cent for siliceous gangue and antimony oxychloride, is as follows : PbS 36.12, Sb2S3 22.20, Cu2S 19.31, FeS 13.59, ZnS 5.87, Ag2S 2.39, MnS 0.52, Bi2S3 traces: total 100. From this analysis Skey calculated the formula Sb2S3.6RS (where R = Pb, Cu, Fe, Ag, Zn), and it was his belief that the mineral, though quite distinct from tetrahedrite, was related thereto.