MINERALOGICAL VARIATIONS OF LOCALIZED FEATURES ON CERES (Invited Presentation)
Although Ceres displays general homogeneity in surface composition, some exceptions can be found at the local scale. For example, Ahuna Mons is a unique isolated elliptical mountain (21x13 km), made up of a summit with sub-radial arcuate structures (ridges and troughs) and steep flanks formed by talus material . Based on FC image data Ahuna Mons was interpreted to be a cryovolcano, formed by ascent of cryomagma and extrusion onto the surface followed by dome development (ibid). VIR spectroscopic analysis of Ahuna Mons highlights a lower abundance of hydrous minerals and NH4-phyllosilicates phases and a higher abundance of Na-carbonates than the surrounding areas observed at the same spatial resolution. Similarly, crater Haulani, characterized by widespread bright ejecta mixed with dark material, shows a reduction of the 2.7 and 3.1-µm bands in VIR data, probably due to lower amounts of hydrous material and NH4-phyllosilicates. Haulani's bright ejecta are characterized by a negative ("blue") spectral slope in the visible to near infrared spectral range. In contrast, the bright material unit in the center of crater Occator was discovered to be the most concentrated extraterrestrial deposit of Na-carbonates .
Even though each of these features has a distinct morphology, they may share some spectral characteristics. Here we discuss the mineralogy of these notable geologic features, with the goal of shedding light on their origin.
 De Sanctis et al., 2015, Nature
 Ruesch et al., 2016, Science
 De Sanctis et al., 2016, Nature