BGS mineralogy and petrology collection record

Sample number	E10895; COLLNO296;
Sample Donor	Blake,Professor
Rock name	'Original entry: Mica-Schist'
Stratigraphy	Not entered
Comments	Mona Complex. Pen-Zone. See Mem.Geol.of Anglesey.p.372. Similar but much biotite, & binary twinning in albite
Locality details	Nr. Pensnynydd
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 50 74
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.