BGS mineralogy and petrology collection record

Sample number	E10879; COLLNO280;
Sample Donor	Blake,Professor
Rock name	'Original entry: Spilite'
Stratigraphy	Not entered
Comments	Mona Complex. Gwna beds. See Mem.Geol.of Anglesey.pp.378-9. Highly altered, but probably once a glassy spilite.
Locality details	Rock in which calcite intrudes. Gwladys
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 40 65
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.