She said this hydration signal was consistent with hydrated calciumsulphate and the scientists think that the bright material in Tintina and the material in the veins could be one and the same.
This outcrop contains yet finer grains but it is cut through with veins that the rover's ChemCam laser spectrometer indicates hold precipitated minerals - most likely hydrated calciumsulphate, possibly bassinite or gypsum.