Supplementing Helmut Waszkis' response, re rosette copper,
per the excellent 1968 U.S. Bureau of Mines (R.I.P.) Dictionary of mining,
mineral, and related terms (1269 pp.)
"Rosette copper: Disks of copper (red from the presence of suboxide) formed
by cooling the surface of molten copper through sprinkling with water. Also
called rose copper. "
Noel Kirshenbaum
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