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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Fourmarierite from
Ruggles Mine, Grafton, Grafton County, New Hampshire, USA


Locality type:Mine
Classification
Species:Fourmarierite
Formula:Pb(UO2)4O3(OH)4 · 4H2O
Comments:"Fourmarierite was doubtfully identified as a minor constituent of gummite from a number of localities, including ... Palermo and Ruggles pegmatites..."
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Fourmarierite data
Locality Data:Click here to view Ruggles Mine, Grafton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:101050
Long-form Identifier:1:3:101050:3
GUID (UUID V4):0
Nearest other occurrences of Fourmarierite
75.0km (46.6 miles) ⓘParker Mountain Mine, Strafford, Strafford County, New Hampshire, USA
References
Frondel, Clifford (1956) Mineral composition of gummite. American Mineralogist, 41 (7-8) 539-568
Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261
 
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