Those analyses have revealed traces of gold and iron, along with rarer minerals such as kamacite, schreibersite, taenite, and troilite
. Now we can add edscottite to that list.
Traces of rare minerals have also been found, including taenite, troilite
, kamacite and schreibersite.
Diogenites, which formed in magma chambers deep in Vesta's crust, are composed mostly of orthopyroxene and hypersthene, with smaller amounts of olivine, plagioclase, troilite
, and chromite.
The most cited monosulfides are tetragonal mackinawite, hexagonal troilite
, monoclinic pyrrhotite, and hexagonal pyrrhotite, all which are relatively stable in oxygen-free acid media [21-23].
The S isotopic values were reported relative to the Canyon Diablo Troilite
(V-CDT) standard, and the analytical uncertainties were better than [+ or -]0.2% .
Sulphur isotope values are reported as relative to the Vienna Canyon Diablo Troilite
(VCDT) in terms of a [delta][.sup.34][S.sub.VCDT][per thousand] and the sulphate oxygen isotope values are reported as relative to the Vienna Standard Mean Ocean Water (VSMOW) in terms of [delta][.sup.18]O.
Sulfur isotopic compositions in pyrite samples are expressed as [[delta].sup.34]S values relative to the Vienna Canyon Diablo Troilite
The isotope values were expressed as parts per thousand or per mil ([per thousand]) or 5 deviation from the internationally recognized standards, VPDB, atmospheric N, VCDT (Vienna Canyon Diablo Troilite
), V-SMOW (Vienna-Standard Mean Ocean Water) (Groning 2004) for C, N, S and O, respectively.
The topics include isothermal sections of the uranium-iron-antimony ternary system, the numerical analysis of time dependent effects in bulk nanocrystalline hard magnets, the high-temperature optical characterization of transition metal dichalcogenides by piezoreflectance measurements, a superhard composite containing boron nitride and silicon nitride, and a comparison of iron-cluster deformations of troilite
phases with non-stoichiometry and vanadium impurity.
where standards are PDB (PeeDee Belemnite) limestone for [[delta].sup.13]C, nitrogen gas in air for [[delta].sup.15]N, and CDT (Canyon Diable troilite
) for [[delta].sup.34]S, and corresponding R values are [sup.13]C /[sup.12]C, [sup.15]N/[sup.14]N, or [sup.34]S/[sup.32]S (Fry, 2007).
Instruments on the rover, including its Mossbauer spectrometer, show the rocks are stony, but also contain iron-bearing minerals present in meteorites found on Earth, such as kamacite and troilite