Monday, 28 December 2015

Dry Gill minerals in more detail.

Following our walk up High Pike here are some more details about the finds - they are correct to the best of our knowledge! Thanks to Tom who took on the research with enthusiasm!

Dry Gill is one of the main sources of campylite in the world and at Dry Gill it is the dominant lead mineral. Campylite is a form of phosphatian mimetite and we found 4 'forms' of  campylite [Pb5(AsO4)3Cl].
The 4 forms included:

  • Lime green campylite 
  • Olive green campylite 
  • Yellow campylite 
  • Lime green mimetite with needles 

Lime green form campylite under a microscope clearly showing the hexagonal cross section through the curved, barrel shaped crystals of campylite.
A lime green form of mimetite with unusual spikey outgrowths/needles under a microscope.
Distinct yellow form of campylite surrounded by psilomelane which is a form of  manganese oxide (approximately Mn02).
Psilomelane is commonly associated with mimetite.
A single large lime green form campylite on quartz.
A group of small lime green form campylite on quartz.

High Pike and the Dry Gill shales

A walk up High Pike and then down via the Dry Gill shales. A couple of small trilobite fragments and some nice crystals of mimetite in different forms.


Rocky enjoying his run out - before the next storm batters poor Cumbria! 

Sunday, 13 December 2015