Datolite
Mandan Mine, Mandan, Grant Township, Keweenaw County, Michigan, USA
9.1 x 6.0 x 2.2 cm (largest). A showy and excellent sawed and polished datolite nodule pair from the obscure Mandan Mine of Michigan’s Copper Country. The slices have high lustre and a nice porcelaneous texture. The thick rind is creamy-white and surrounds a translucent, grayish-green core. The interior is beautifully accented with veins and ...
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