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Tourmaline from
Trencrom Hill, Trencrom, Ludgvan, Cornwall, England, UK

Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:A(D3)G6(Si6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
References
References:Wilson, A. C. (1975). An Occurrence of Sapphire in the Land's End Granite, Cornwall. HM Stationery Office.
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Trencrom Hill, Trencrom, Ludgvan, Cornwall, England, UK
Nearest other occurrences of Tourmaline
2.1km (1.3 miles) Wheal Providence, Providence Mines, Carbis Bay, St Ives, Cornwall, England, UK
3.6km (2.3 miles) St Ives Consols (incl. Wellesley Mine; Wheal Mary), St Ives, Cornwall, England, UK
5.1km (3.1 miles) Hor Bal (Mungren's Hill Mine), St Ives, Cornwall, England, UK
6.0km (3.8 miles) Rosemorran Mine (Rosevale Mine; Wheal Chance), Zennor, Cornwall, England, UK
7.7km (4.8 miles) Zennor Consols (Carnelloe Consols), Zennor, Cornwall, England, UK
8.4km (5.2 miles) Wherry Mine, Wherrytown, Penzance, Cornwall, England, UK
9.6km (6.0 miles) Great Work Consols, Germoe, Cornwall, England, UK
9.7km (6.0 miles) South Parbola Mine (Wheal Jennings; Parbola Mine), Reawla, Gwinear-Gwithian, Cornwall, England, UK
10.1km (6.3 miles) Trewidden Bal, Trewidden, Madron, Cornwall, England, UK
10.7km (6.7 miles) Avarack & Nancothan Mine (aka Drift Moor Consols), Paul, Cornwall, England, UK
 
Mineral and/or Locality  
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