There's an obit and list of publications here.
https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20Miss%20Nellie%20Kirkham%20(Mrs.%20J.H.D.%20Myatt)%20-%20An%20Obituary.pdf
I think the theory is that radioactivity in the hydrocarbons associated with the area (e.g. Windy Knoll)) has distored the crystal lattice to give the coloured bands.
Speaking for myself, I'd be wary about going underground with anyone who was pissed, stoned or high on anything apart from the smell of their own farts.
The wife suggested that we spice things up a bit and play doctors and nurses. So I put her on a trolley in the hallway and left her for 48 hours.
Last week my neighbour described me as a bit of a looker. Well, voyeur was the actual word she used.