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Besides its unusual supply/demand relationships, other special features of the baby business also lead Spar to argue for government intervention.
"Lead spar" minerals as noted in Ignaz von Born's 1772 catalog, in Latin, with modern English translations.
Another line in the catalog lists "plumbum spatosum flavescens effervescens, Carinthiae" ("lead spar, yellowish, effervescent [in acid], from Carinthia").(*) Some mineralogists have concluded that this, too, refers to wulfenite, but wulfenite does not effervesce in acid.
The catalog specifies the locality of the yellowish effervescent lead spar as the town of Villach in Carinthia.
The occurrence of the yellow lead spar can be described as follows: It is not mined.
In 1845 Wilhelm von Haidinger named the yellow lead spar after the Jesuit naturalist Franz Xavier von Wulfen, in honor of Wulfen's magnificent work describing the lead spars of Carinthia (Abhandlung vom Karnthnerischen Bleyspate, published in Vienna in 1785).