Yellow Datolite, Michigan Thomsonite and Isle Royale Greenstone Pendant: YDMTGN-1


Yellow Datolite, Michigan Thomsonite and Isle Royale Greenstone ( Old Collection) Pendant: YDMTGN-1

Chlorastrolite (Greenstone)
Chlorastrolite is the “official state gem” of Michigan. It is a variety of the mineral pumpellyite and is found primarily as a small, green, rounded beach pebble, showing a turtleback pattern. Greenstones can still be found on Isle Royale and on some of the mine waste piles of the Copper Country, although it is a rare mineral.

Thomsonites, one of the rarer zeolite minerals, have been collected as gemstones from a series of lava flows along Lake Superior in Minnesota and to a lesser degree in the Keweenaw Peninsula of Michigan. Thomsonite nodules can be found still embedded in basaltic matrix rock, or loose along the shoreline in areas where they have eroded from the basalt. When polished thomsonites sometimes but not always display a "cat's eye" effect.

Datolite is a borosilicate mineral (hardness: 5-5.5). It is associated with native copper deposits in Michigan’s Keweenaw Peninsula. The characteristic ‘cauliflower’ shaped nodules range from 1-12 inches. The rarest colors are yellow, orange, green and red. White and pink are more common. At times specks of copper or silver appear with the datolite. This rare mineral is found in old waste rock piles and in Lake Superior.

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