One would cut a piece of alum into the ordinary octahedron form and scrape it so as to round off the edges.
"Reminiscences of a South African Pioneer"
W. C. Scully
The stone, a clear yellow octahedron of about ten carats' weight, was passed from hand to hand to be admired and appraised.
"Reminiscences of a South African Pioneer"
W. C. Scully
The other piece of money in circulation was octahedron in shape or form.
"Memoirs of Orange Jacobs"
Orange Jacobs