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Mcgovernite
- Sterling mine
- Sussex County
- New Jersey
- U.S.A.
- 7.9 × 6.7 × 3.5 cm – Small cabinet specimen (under 10 cm)
Mcgovernite is a rare zinc manganese arsenite arsenate silicate. Palache & Bauer (1927) named the species in honor of Franklin miner and collector extraordinaire James McGovern (1861-1915). Wuensch (1960) found rhombohedral symmetry and especially large unit cell with c ~ 205 Å. Decades later, Hawthorne (2018) solved the crystal structure of mcgovernite, which consists of 84 polyhedral layers.
Mcgovernite forms red-brown scales with pearly luster, mostly covering one side of characteristic franklinite-willemite-calcite matrix. Minor pyrochroite and chlorophoenicite are associated on the fracture surface. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona.
Price: $350
Item code: MS2010
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