We discussed on this forum before the observations of Lisse et.al. that the Deep Impact mission showed carbonates and clays within Temple I.
The results have now been published in Science:

Scientists Gaining Clearer Picture of Comet Makeup and Origin
by Staff Writers
Laurel MD (SPX) Jul 16, 2006
"From its orbit, Spitzer's infrared spectrograph closely observed the materials ejected from Tempel 1 when Deep Impact's probe dove into the comet's surface. Astronomers spotted the signatures of solid chemicals never seen before in comets, such as carbonates (chalk) and smectite (clay), metal sulfides (such as fool's gold), and carbon-containing molecules called polycyclic aromatic hydrocarbons, commonly found in barbecue grills or automobile exhaust on Earth.
"Lisse said the clay and carbonates were surprises because they typically require liquid water to make - and liquid water isn't found in the regions of deep space where comets form. Also surprising was the superabundance of crystalline silicates, material formed only at red-hot temperatures found inside the orbit of Mercury."
http://www.spacedaily.com/reports/Scientists_Gaining_Clearer_Picture_of_Comet_Makeup_and_Origin_999.html

Spitzer Spectral Observations of the Deep Impact Ejecta.
Published Online July 13, 2006
Science DOI: 10.1126/science.1124694
http://www.sciencemag.org/cgi/content/abstract/1124694v1

Bob Clark