Thank you Laurel I shall give it a go, especially if I do end geting some solar panels.

Shungite is mostly carbon and biochar which is basically charcoal so it makes sense. You could always build a timber building too and make it with hempcrete and incorporate something carbonaceous in that too. They are rather nice buildings when you get them right. You can then render it with more carbonaceous plaster and paint after that!...Might have to look into carbon paint now, apparently carbon black was made from Shungite!