BGS mineralogy and petrology collection record

Sample number	E28228; COLLNOJW162;
Sample Donor	Wright,J.E.
Rock name	'Original entry: Microdiorite'
Stratigraphy	Not entered
Comments	? Microdiorite, pyritous; from c 10ft thick dyke with qtz vein
Locality details	Ffestiniog HE Tunnel No.1. 834 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.