Cassiterite
Great North Downs Mine, Scorrier, Redruth, Cornwall, England, UK
From unnamed shaft dump over 50 metres west of Lemons Whim Shaft.
Specimen shows elongate tetragonal prisms of cassiterite, some of which are tending towards the 'sparable tin' form.
Unfortunately, many of the terminations have been lost, but the largest crystal is around 8.5mm in length.
The matrix comprises a grey, metasedimentary ...
© Dale Foster collection