BGS mineralogy and petrology collection record

Sample number	E28232; COLLNOJW166;
Sample Donor	Wright,J.E.
Rock name	'Original entry: Microdiorite'
Stratigraphy	Not entered
Comments	? Microdiorite, pyritous; from 20 ft exposed in S wall of Tunnel. Probably N edge of branch of Dyke.? same as JW161
Locality details	Ffestiniog HE Tunnel No.2. 740 ft from chainage zero point.
50k map sheet	Snowdon (119) View images in GeoScenic related to 'Snowdon' View the geology near 'Snowdon'
Map reference
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.