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

.    Mass Mine is one of several datolite-producing mines around Mass City with a good variety of colors
and shares the same Pewabic Lobe with more well known Caledonia Mine and Quincy Mine.

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