BGS mineralogy and petrology collection record

Sample number	E10829; COLLNO230;
Sample Donor	Blake,Professor
Rock name	'Original entry: Sodium Felsite'
Stratigraphy	Not entered
Comments	see mem. Geology of Anglesey p 527 c. f. E 10464 Cryptocrystalline with Phenocrysts of Albite & Quartz??.? Of Albite see loose leaf sheet re query word Palaeozoic
Locality details	Boss above Pen-gorph-wysfa E. of Amlwch
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 465 920
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.