Mineralpedia Details for 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)2ยท4H2O
- 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
- WebMineral
- View Earlshannonite
- Mindat
- View Earlshannonite
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
