BGS mineralogy and petrology collection record

Sample number	E11045; COLLNO126;
Sample Donor	Matley, C.A
Rock name	'Original entry: Sodium-Felsite. Qtz. Porphyry.'
Stratigraphy	Not entered
Comments	Palaeozoic Intrusions. See Mem.Geol.of Anglesey.pp.494-5:529. Albite, orthoclase, biotite, etc. Cryptocrystalline with phenocrysts of quartz, albite & ??..tite. Composite dyke.
Locality details	South of Groes-Fechan
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 351 916
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.