BGS mineralogy and petrology collection record

Sample number E61637; COLLNOMH1551;
Sample Donor Howells,M.F.
Rock name Tuff, Rhyolitic .
Stratigraphy Not entered
Comments Acid tuff, crystal rich, ?? Granophyre
Locality details ESE of Tyran Mawr
50k map sheet Barmouth (149)

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View a geological map near 'Barmouth'

Map reference SN 6906 1127
Year collected Not entered 
Bore name Not applicable
Confidentiality No restrictions

Petrological thin sections

Links to high resolution images

Transition from XPL to PPL light


Cross Polarized, E61637

Plane Polarized, E61637

Plane Polarized, E61637