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Gilbertite from
Halvosso Quarry (Halvasso Quarry; Kessel Downs Quarry), Mabe, Cornwall, England, UK

Locality type:Quarry
Classification
Species:Muscovite var: Gilbertite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gilbertite data
Locality Data:Click here to view Halvosso Quarry (Halvasso Quarry; Kessel Downs Quarry), Mabe, Cornwall, England, UK
Nearest other occurrences of Gilbertite
3.4km (2.1 miles) Balmynheer Mine, Porkellis, Wendron, Cornwall, England, UK
4.1km (2.5 miles) Fatwork Mine, East Wheal Lovell (incl. Tregonebris Mine), Trewennack, Wendron, Cornwall, England, UK
4.5km (2.8 miles) Lower Kergilliack Quarry, Budock, Cornwall, England, UK
4.9km (3.1 miles) South Wendron Mine (South Wheal Lovell; Lovell Consols), Trewennack, Wendron, Cornwall, England, UK
12.2km (7.6 miles) Great Wheal Fortune, Breage, Cornwall, England, UK
14.9km (9.3 miles) Megiliggar Rocks (Tremearne pegmatite), Breage, Cornwall, England, UK
21.9km (13.6 miles) South Wheal Providence (South Wheal Speed), Carbis Bay, St Ives, Cornwall, England, UK
29.8km (18.5 miles) Trethosa China Clay Pit, Treviscoe, St Stephen-in-Brannel, Cornwall, England, UK
31.0km (19.3 miles) Stenna Gwyn Mine (Stennagwyn Mine), Foxhole, St Stephen-in-Brannel, Cornwall, England, UK
35.0km (21.8 miles) Balleswidden Mine, St Just, Cornwall, England, UK
 
Mineral and/or Locality  
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