Is this the material described below in JPL press release/
"The bright patch of disturbed soil, dubbed "Paso Robles," has
the highest salt concentration of any rock or soil ever
examined on Mars. Combined information gained from inspecting
it with Spirit's three spectrometers and panoramic camera
suggests its main ingredient is an iron sulfate salt with
water molecules bound into the mineral. The soil patch is
also rich in phosphorus, but not otherwise like a high-
phosphorus rock, called "Wishstone," that Spirit examined in
December. "We're still trying to work out what this means,
but clearly, with this much salt around, water had a hand
here," Squyres said."
Strange sounding composition - anyone seen any further information?