This 1953 vintage ad for Northern Pacific Railway has a black and white photo of hands full of Fluorspar with the headline, “This rock could make you rich”.
Year Published: 1953
Approximate overall size – inches: 10 x 13
“You can crumble this colored, crystal-like ore in your fingers, You can heat it and watch it glow in the dark.
Just last year two lumberjacks discovered it on the Crystal Mountain mine near Darby, Montana–a rich, unusually pure deposit of fluorspar, a valuable mineral vital in the making of steel.”
This is a 65 yr. old original vintage ad removed from a 1953 publication and is not a reproduction of any kind.
Wikipedia on Fluorite