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Wheal Coates, St Agnes, St Agnes District, Cornwall, England, UK
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UK Grid Reference: SW700501
Latitude: 50°18'19"N
Longitude: 5°13'49"W
 
 
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.

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)".

Mindat Articles

Pseudomorphous crystals of oxide of tin, found in Huel Coates mine, in St. Agnes by Jolyon & Katya Ralph


Mineral List

Agardite-(Ce)
Andalusite
Bismite
Bismutite
Cassiterite
var: Wood Tin
Copper
Eulytine ?
Glauconite
Melanterite
Orthoclase
Quartz
Schorl
Svanbergite


14 entries listed. 13 valid minerals.

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References

Sharpe, A. & Smith, J. R.,'Wheal Coates, St. Agnes, An Archaeological Survey for the National Trust,' produced by The Cornwall Archaeological Unit,1986, Truro.
Embrey & Symes, 1987, 69 - "Minerals of Cornwall and Devon"
Rocks & Min.: 16:129.
Coon, J. M. Pseudomorphs of cassiterite, etc., after feldspar at Wheal Coates, St. Agnes, Cornwall: Roy. Geol. Soc. Cornwall, Tr, 16(pt 6), 297-310.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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