Sparable (acicular) tin is recorded from from a number of Cornish mines including Gavrigan Tin Stream Works by R. H. Solly in the The Mineralogical Magazine.
He notes that "Sparable Tin" is peculiar to Cornwall, and has been given to this variety of Cassiterite on account of its so-called resemblance to the sparable nail of the cobbler"
In the course of tin streaming, four tin lodes were discovered adjacent to the River Fal and were worked by the Gavrigan Mine (SW935592). The noted collector Sir Arthur Russell obtained specimens of wood tin nearby (Hamilton Jenkin 1964).
References:
THE MINERALOGICAL MAGAZINE AND JOURNAL OF THE MINERALOGICAL SOCIETY.
No. 48. MARCH, 1891. Vol. IX.
Mines & Miners of Cornwall, A K Hamilton Jenkin, Vol V111 1964
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UK OS Grid Reference: SW935592 Map Reference: 50°23'44"N , 4°54'20"W
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Mineral List:1 entry listed. 1 valid mineral.
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