The Encyclopedia Americana (1920)/Jaspilite
JASPILITE, a compact siliceous rock similar to jasper in appearance. Its occurrence in the Lake Superior region is of economic importance as it appears invariably above the ore-bearing formation.
Edition of 1920. See also Banded iron formation on Wikipedia, and the disclaimer.
JASPILITE, a compact siliceous rock similar to jasper in appearance. Its occurrence in the Lake Superior region is of economic importance as it appears invariably above the ore-bearing formation.