. Despite
what I heard about other mines producing green datolites, Isle Royale Mine
seems to be only one I'm sure that produced "well-greened" (no bluish tint)
datolites due to the weathering of very minute copper inclusions by ancient
brines. The interesting thing about those datolites from Isle Royale mine
is that they're like sponges, soaking up water and as a result, their colors
intensified. The datolites from that mine may be most greenish of any datolites
found so far (those greenish datolites from Centennial Mine tend to be
more bluish). Most datolites from Isle Royale are white and some came with
black to gray copper inclusions.
Again, this mine dump had
been bulldozed several times and I don't know if any more datolites still
can be found (never have been there).
Looks bit more turquoise colored when wet.
Typical datolites with gray copper inclusions
Most greenish datolites(without bluish tint) I have seen so far.
