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)".
Refs.: (in part):
Embrey & Symes, 1987, 69 - "Minerals of Cornwall and Devon"
Rocks & Min.: 16:129.
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UK OS Grid Reference: SW700501
Map Reference: 50°18'19"N , 5°13'49"W
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Mineral List:11 entries listed. 10 valid minerals.
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