Mineral: Granitic sill.
Locality: South Crofty Mine, Northern Branch lode, Pool, Camborne - Redruth - Saint Day District, Cornwall, England / United Kingdom
Dimensions: 3 or 4 metres

Description: Other flat-lying magmatic structures at South Crofty are known as 'quartz floors' and were coarsely crystalline, with feldspar, wolframite and cassiterite.

All pictures, text, design © Forum FMF 2006-2024