Paraiba Tourmaline for Dummies
, the sodium iron (divalent) endmember in the group. It may account for 95% or even more of all tourmaline in character. The early record from the mineral schorl demonstrates the identify "schorl" was in use before 1400 due to the fact a village regarded today as Zschorlau (in Saxony, Germany) was then named "Schorl" (or small variants of the ident