There's Claystone and Sandstone in the photo...both look "soggy" simply because someone has put water on the sample. Commonly done when doing a microscope description of sidewall cores or cuttings. Descriptions are usually done on a wet sample and water is also put on samples to get an idea of porosity/permeability.
Note the USGS rock colour charts commonly used at the wellsite and in labs are actually designed for use on wet (outcrop) rock samples.
There's Claystone and Sandstone in the photo...both look "soggy"...
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