BGS mineralogy and petrology collection record

Sample number	E10834; COLLNO235;
Sample Donor	Blake,Professor
Rock name	'Original entry: Biotite-Gneiss'
Stratigraphy	Not entered
Comments	see mem. Geology of Anglesey p 328 Biotite Gneiss Mona Complex The Gneisses
Locality details	Porth Lygan (?Helygen)
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 491 908
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.