BGS mineralogy and petrology collection record

Sample number	S52670; COLLNOYR1360;
Sample Donor	Smith,D.I.
Rock name	'Original entry: Microdiorite'
Stratigraphy	Not entered
Comments	Microdiorite dyke centre
Locality details	Cruachan Main Tunnel, Chainage 20900 ft
50k map sheet	Oban (45) View images in GeoScenic related to 'Oban' View the geology near 'Oban'
Map reference	NN 1159 3332
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.