BGS mineralogy and petrology collection record

Sample number	E10893; COLLNO294;
Sample Donor	Blake,Professor
Rock name	'Original entry: Hornblende Gneiss'
Stratigraphy	Not entered
Comments	Mona Complex. See Mem.Geol.of Anglesey.pp.376-7. Characters unusual. Can it be a gneiss involved in the Pen-Zone metamorphism ?
Locality details	N. Boss, Holland Arms
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 474 725
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.