BGS mineralogy and petrology collection record

Sample number	E4221; COLLNOHDC102; NEG1581M; NEG182M;
Sample Donor	H.D.C
Rock name	Dolerite (Synonymous With Microgabbro). 'Original entry: Ophitic Diabase'
Stratigraphy	Not entered
Comments	Not entered
Locality details	Moel-y-Guest Qrys. Nr. Portmadoc
50k map sheet	Snowdon (119) View images in GeoScenic related to 'Snowdon' View the geology near 'Snowdon'
Map reference
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.