Austinite, Birnessite
Glory Hole, Gold Hill Mine, Gold Hill, Gold Hill Mining District, Tooele County, Utah, USA
4.0 x 3.4 x 1.3 cm. Discrete clusters of drusy, lustrous and translucent, colorless austinite are emplaced on a matrix of botryoidal, dark grayish-brown birnessite: an uncommon, hydrated, sodium, calcium, manganese oxide. Unusual and sparkly. Ex. Harold Urish Collection.
© Rob Lavinsky & irocks.com