View larger
Michigan Greenstone .5 grams
Gs760
New
An oval to round cabochon, quite flat, with the small round patterns expected on Michigan's Greenstone. .5 grams
7/8" x 3/4"
or approximately .7mm x .9mm x .5mm
1 Item
Unique Item
More info
This stone has a nice chatoyance showing light and dark shiny pattern. At .5mm high it is thicker than some cabochons of this size. It is well suited for use in a ring or pendant.
The Michigan State Gem is commonly called "Greenstone", "Michigan Greenstone" or "Isle Royal Greenstone". The correct mineral name is Chlorastrolite, a variety of pumpellyite. Chlorastrolite is found as small pebbles on the beaches of Isle Royale in Lake Superior and also throughout the Keweenaw Peninsula. Greenstone is associated with the native copper deposits of Northern Michigan. The Michigan Greenstones are found as green/black nodules in vesicles of the amygdaloidal basalts. Most greenstones are smaller than a pea, and really large ones are extremely rare.
