Mindat Logo

Wheal Coates, St Agnes, St Agnes District, Cornwall, England, UK
This page is currently not sponsored. Click here to sponsor this page.

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

var: Wood Tin
Eulytine ?

14 entries listed. 13 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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.

Mineral and/or Locality  
Search Google  
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.
Current server date and time: August 29, 2014 05:17:29 Page generated: August 21, 2014 11:32:00
Mineral and Locality Search
and/or Locality:
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds