Tourmaline everywhere. When I began my work with tourmaline and boron in granites, I spent several field seasons working in the famous granites of Cornwall, SW England, in collaboration with Dr. David A.C. Manning. Manifestations of boron enrichment and tourmaline growth are everywhere, and usually very spectacular. Here is a photo of the classic tourmaline-cemented breccia from Wheal Remfry kaolin mine. Clasts of tourmaline-bearing granite are ripped up along with stringers and wisps of entrained quenched melt (now porcelaneous rhyolite) and all cemented by a tourmaline groundmass.