Medium grained quartz rich sandstone (finer/equal than 130um) with a 
ferrugginous/desert varnish coating.

Clay mineralogy  : XRD analysis indicates the presence of kaolinite and 
muscovite/illite. PIMA SWIR spectra identifies kaolinite and montmorillonite but 
fails to identify illite. However Fieldspec NIR spectra identifies hematite 
within the desert varnish suggestive of a multi-layer iron oxide desert varnish.

Coarse mineralogy : XRF normative analysis estimated 71% quartz, 14% 
illite/muscovite, 5% kaolinite and 7% smectite.

Spectral Description:  The presence of the 12.4-12.8 um doublet suggests the 
medium quartz grained texture. Spectral features suggestive of kaolinite are 
observed at 9.0, 9.9 and 11.0 um for fge2, with a broad 9.0-10 um reststrahlen 
feature suggestive of the significant clay mineral content. 

