BGS mineralogy and petrology collection record

Sample number	S52667; COLLNOYR1356;
Sample Donor	Smith,D.I.
Rock name	'Original entry: Coarse Microdiorite'
Stratigraphy	Not entered
Comments	Coarse microdiorite dyke
Locality details	Cruachan Main Tunnel, Chainage 23000 ft
50k map sheet	Oban (45) View images in GeoScenic related to 'Oban' View the geology near 'Oban'
Map reference	NN 1157 3395
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.