See Keim & Markl, 2017. Formation of galena pseudomorphs after pyromorphite. N. Jb. Miner. Abh. (J. Min. Geochem.) 194/3 (2017), 209–226.

"Galena [PbS] pseudomorphs after pyromorphite [Pb5(PO4)3Cl] are a sought-after mineral specialty for museums and mineral collectors worldwide. A collection catalogue from 1772, where specimens from the Dreifaltigkeits Mine near Zschopau in Saxony, Germany, are listed, represents the earliest written document on such specimens (BORN 1772). These samples were not recognized as pseudomorphs but as a discrete mineral and were named “Blaubleierz” by WERNER & HOFFMANN (1789). This denotation is still in use today and in German literally means blue lead ore."

"BBE is known from only five relevant localities worldwide, namely Dreifaltigkeits (type locality) and Himmelfürst Mines, Saxony, Germany; Kautenbach Mine, Rhineland-Palatinate, Germany; Huelgoet, Bretange, France, and Wheal Hope, Cornwall, United Kingdom (BLUM 1843, GAIT & BACK 1992)."

Phillips (1816) made no mention of Cornish "Blue Led," but in his 1823 2nd edition, the recent discovery of Cornish material was reported.