BGS mineralogy and petrology collection record

Sample number	E10689; COLLNO90;
Sample Donor	Blake,Professor
Rock name	'Original entry: Limestone. Calcareous Band In Gneiss.'
Stratigraphy	Not entered
Comments	Mona Complex. Pen-Zone. See Mem.Geol.of Anglesey.p.341. Calcite, white mica, quartz, graphite. Well developed mica plates. Film of graphitic dust
Locality details	West of Trecastell Bay
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 331 706
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.