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Dwarves' Earth Treasures Online Museum:
Mesnard Datolites
Mesnard Mines, 
Hancock, Houghton Co., Michigan
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 .        "Old Reliable" Quincy Mine is considered a historical landmark of the Copper Country, a nickname for copper producing Keweenaw Peninsula, and many of the original buildings are still standing and preserved. The Quincy and Mesnard Mines are very well known for producing many highly prized colorful datolites and some coming in baseball-sizes. Since Quincy, Mesnard and Franklin mines are connected to each other that it's not easy to tell the datolites from the mines apart. The mine dumps of Franklin already have been taken away for road-making so no more datolites coming from Franklin.

Mensard Mine

Orangish yellow color With calcite inclusion
(grew there before datolite did)
Salmon colored Reddish "Fireworks Bursts"
Classic Orangish yellow color
(Temporary picture till I use digital camera on it)		 Unusually coarse grained specimen