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MD-261634
Mcgovernite
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
Miniature, 3.5 x 2.7 x 1.9 cm
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Mcgovernite is a very rare arsenate, unique in the world to the Sterling Mine of New Jersey. Mcgovernite is also the mineral species with the largest number of atoms in the unit cell. This specimen is extremely rare and exceptional, in that much of the piece consists of lustrous, bronzy-brown crystal plates, along with aggregates of mcgovernite. Crystals reach 5 mm. Mcgovernite usually occurs as thin coatings or as radiating spherical sprays of crystals. This extreme rarity is very well crystallized for the species.