Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Clarkeite from
Ruggles Mine, Grafton, Grafton County, New Hampshire, USA


Locality type:Mine
Classification
Species:Clarkeite
Formula:(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
Comments:Frondel (1956) noted: "Clarkeite has been said to occur in reddish-brown gummite at the Ruggles pegmatite, Grafton Center, New Hampshire, but it was not observed in specimens from this locality examined in the present study." As gummite and other minerals were frequently reported from this and other localities without data, frequently as wishful thinking, the clarkeite folklore is unbelievable given the thoroughness of Frondel's uranium mineral research.
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Clarkeite data
Locality Data:Click here to view Ruggles Mine, Grafton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:29558
Long-form Identifier:1:3:29558:3
GUID (UUID V4):0
Nearest other occurrences of Clarkeite
19.6km (12.2 miles) ⓘPalermo No. 1 Mine, Groton, Grafton 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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