BGS mineralogy and petrology collection record

Sample number	E10663; COLLNO64;
Sample Donor	Blake,Professor
Rock name	'Original entry: Quartzite-Schist'
Stratigraphy	Not entered
Comments	Mona Complex. Holyhead Quartzite. See Mem.Geol.of Anglesey.1919.p.260. Quartz & heavy accessories, w.secondarymica. Blastopsammitic. Slide thick.
Locality details	Near Porth Gwalsh
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 259 754
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.