BGS mineralogy and petrology collection record

Sample number	E57327
Sample Donor	Dangerfield,J.; Hawkes,J.R.; Wheatley, C.W.;
Rock name	'Original entry: Porphyritic Volcanic Rock'
Stratigraphy	Not entered
Comments	Quartz porphyry.
Locality details	Loose block, 1.35 Km. at 355 deg. from Gunnislake Station.
50k map sheet	Tavistock (337) View images in GeoScenic related to 'Tavistock' View the geology near 'Tavistock'
Map reference	SX 4257 7242
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.