Please see the excellent report and multiple images of the quartz block in the roofbox at
https://boynevalleytombs.wordpress.com/
See also http://irisharchaeology.ie/2012/12/images-of-newgrange-through-the-ages/
The many secrets in the mystery of Dagda’s Temple are currently being written into an upcoming book on Ireland’s ancient Calendar, Starlore and Mythology, for updates on its availability please join our moonthly free newsletter.