Wheal Coates, St Agnes, St Agnes District, Cornwall, England, UK
Famous for the highly desirable and classic pseudomorphs of cassiterite replacing Carlsbad twins of orthoclase feldspar that were found around 1828 over a distance of several fathoms in a small vein composed mainly of "light red sand". Typically around 2.5cm or less, but known to a maximum of 5.6cm.
Photo: Tom Hardman
UK Grid Reference: SW700501
Good examples are rare and fakes were made in the 19th century by coating appropriately shaped lead sheet with granular cassiterite (eg - see Embrey & Symes, 1987, "Minerals of Cornwall and Devon - figure 74)".
Refs.: (in part):
Embrey & Symes, 1987, 69 - "Minerals of Cornwall and Devon"
Rocks & Min.: 16:129.
Mindat ArticlesPseudomorphous crystals of oxide of tin, found in Huel Coates mine, in St. Agnes by Jolyon & Katya Ralph
var: Wood Tin
11 entries listed. 10 valid minerals.
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Sharpe, A. & Smith, J. R.,'Wheal Coates, St. Agnes, An Archaeological Survey for the National Trust,' produced by The Cornwall Archaeological Unit,1986, Truro.
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