Figure 5. Portion of a Mastcam color mosaic taken on sol 1647
at Mount Desert Island looking to the northeast along the linear Bagnold
dunes. Platy bedrock is evident in the foreground. Number at the top of
the figure denotes azimuthal direction measured clockwise from north.
Image credit: NASA/JPL-Caltech/MSSS.
An extensive imaging and APXS measurement campaign focused on this
sample, named Ogunquit Beach. A left wheel scuff into the edge of MDI
demonstrated that the sands are slightly cohesive and break into small
clods (Figure 6). In the wavelengths covered by Mastcam color images
(RGB 0.640, 0.554, 0.495 µm; Bell et al. 2012) the deposits exhibit a
relatively reddish-brown surface color, with darker sands underneath
(Figure 6). Analysis of Mastcam multispectral data showed that the
interior deposits are dominated by ferrous silicate minerals (Johnson et
al., 2018). A CheMin sample was acquired by scooping several centimeters
into the sand deposit and delivering a portion sieved to <0.15
mm to the instrument. As discussed in Section 2, CheMin data showed the
presence and abundance of amorphous and ferrous silicate phases.