The metadata for unpacked raster mosaic datasets cannot be viewed in ArcCatalog.
The following text is displayed when the 'Description' tab is clicked:
"The item's XML contains errors."
This is a known issue.
Use the Consolidate Layer geoprocessing tool located in ArcToolbox > Data Management > Package to create the data and layer file into a single folder.
Use a third-party program to compress the new folder and data for sharing.