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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Halloysite from
Penberthy Croft Mine, St Hilary, Cornwall, England, UK


Locality type:Mine
Classification
Species:Halloysite
Formula:Al2Si2O5(OH)4 · n(H2O)
Comments:Verified on a specimen submitted to the NHM London, pre 2000.And further confirmed in 2025 XRD,EDX.
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
SEM-EDS
Confirmation Details:Where Tested and Reference ID: NHM London XRD
Data
Mineral Data:Click here to view Halloysite data
Locality Data:Click here to view Penberthy Croft Mine, St Hilary, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:19224
Long-form Identifier:1:3:19224:0
GUID (UUID V4):0
Nearest other occurrences of Halloysite
13.8km (8.6 miles) ⓘCook's Kitchen Mine, Pool, Carn Brea, Cornwall, England, UK
81.1km (50.4 miles) ⓘPhoenix United Mine, Minions, Linkinhorne, Cornwall, England, UK
References
 
and/or  
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