BGS mineralogy and petrology collection record

Sample number	E11391; COLLNO163;
Sample Donor	Greenly,E.
Rock name	'Original entry: Powder Of Acid Gneiss. Idocrase In Sillimanite Gneiss'
Stratigraphy	Not entered
Comments	Mona Complex. The Gneisses. See Mem.Geol.of Anglesey.pp.135-6: 328-9. Green mineral, identified as idocrase Residues
Locality details	Coast 400ft. SSW.of "P"of "P"enrhyn Glas
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 491 910
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.