The colored text is from myself. During my visit in December 1996,
could see some quartz
(pers. comm. P. Mulligan ) at the
of the mound in a circle of some 7.5 meters from the now blocked
See below picture, where I corrected the colors using a colorcard.
A test to determine if stones are gypsum, calcite or quartz can be
Some tests are:
A photograph of the mound Dowth:
Note from O'Kelly, , Plate 18: "note the gradual slope of the mound towards the kerb and the absence of a bank of cain slip outside it".
At Newgrange one can see that it was build in many phases. A good example is:
Look at the possible revetment stones (green) some 7 m from the K95.
Combining the above and knowing that the cairn slip at Newgrange was
some 10 m, it could be that the cairn of Dowth was some 7.5 m smaller
diameter than the kerb circle. The cairn could have been covered, at
at the west side, with quartz.
The strange thing though is that the entrance of the small passage was then outside the cairn!
Excavation is of course needed to validate this idea.