Volatiles are relative. My remark earlier should have been qualified. I was not thinking what we Earthlings commonly think of as volatites - H2O, CO2, NH3, etc.
I grew up with text books that offered a silicate, iron model of Mercury that left little room for higher temperature volaties such as K and S.
The sulfur content is 10 x the Earth. That is significant. Again I say WOW.
There will be a joint ESO-DPS MESSENGER breifing Wednesday at 12:15 CSET. Going to try and catch it .... not sure if anything new since last week but what the heck.
Wednesday 05 October – Mercury and MESSENGER Mission Briefing
Mercury after 6 months of MESSENGER orbital observations (Sean Solomon), Geometry of Mercury's magnetic field and implications for Mercury's dynamo and magnetosphere–surface interactions (Brian Anderson), The dynamics of Mercury's exosphere (Bill McClintock), Mercury's geological and surface compositional evolution (Brett Denevi), Variations in surface reflectance spectra (Noam Izenberg), BepiColombo Current Status (Johannes Benkhoff).
Webcast link: http://meetings.copernicus.org/epsc-dps201.../wednesday.html