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Mineralpedia Details for Earlshannonite

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Earlshannonite

Earlshannonite

Named to honor Earl V. Shannon, a former American mineralogist and chemist for the United States National Museum in Washington D.C., USA. Earlshannonite is a rare mineral that occurs as a late-stage secondary mineral in lithium,-rich granite pegmatites. Localities for Earhshannonite include in the United States at the Emmons, Dunton, and Ryerson Hill quarries in Maine and the Foote and LCA mines in North Carolina, in Germany at the Hagendorf Sud pegmatite in Bavaria, in the Czech Republic at Dolni Bory in Moravia and the Huber stock in Bohemia, and in Poland in various pegmatite occurrences in Lower Silesia.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/earlshannonite.pdf

Formula
Mn2+Fe3+2(PO4)2(OH)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Radial, Spherical 
Cleavage
Good, Good, None 
Luster
Vitreous (Glassy) 
Color
yellow, reddish brown 
Streak
light brown 
Class
Monoclinic - Prismatic 
Fracture
Even 
Hardness
3-4 
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Earlshannonite from Foote mine, Cleveland Co., North Carolina, United States

Earlshannonite
            from Foote mine, Cleveland Co., North Carolina, United States

This mineral is a close kin to Whitmoreite, containing Mn2+ substituting for the Fe2+ and forming Earlshannonite as flattened, thick, prismatic(?) crystals in clusters to about 0.5mm on dark green Mitridatite

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