.	Dwarves' Earth Treasures Online Museum: Mass Mine Datolites Mass City, Ontonagon Co., Michigan	.

.    Mass Mine is one of several datolite producing mines to the south of Mass City with a good variety of colors
and shares the same Pewabic Lobe with Caledonia Mine and Quincy Mines. Owned by Red Metal Retreat.

WIth weak purple color	Pink color, not sure if  it's from Mass Mine or Nassau Mine.