I'm not a mineralogist but here's one I'm familiar with here in UK! Chiastolite is pretty common on Skiddaw in the English Lake District. Forms a layer within hornfelsed mudstone around pluton of granite (the Skiddaw Granite) from the Caledonian Orogeny. The Caldbeck Fells or 'Back o' Skiddaw' are rich in mines and minerals although a bit dull in hillwalking terms.
I'm not a mineralogist but here's one I'm familiar with here in UK! Chiastolite is pretty common on Skiddaw in the English Lake District. Forms a layer within hornfelsed mudstone around pluton of granite (the Skiddaw Granite) from the Caledonian Orogeny. The Caldbeck Fells or 'Back o' Skiddaw' are rich in mines and minerals although a bit dull in hillwalking terms.
Excellent article Richard!