BGS mineralogy and petrology collection record

Sample number E61964; COLLNOMH1565;
Sample Donor Howells,M.F.
Rock name Rhyolite.
Stratigraphy Not entered
Comments Clast rich acid tuff
Locality details S of Twll yr Ogof
50k map sheet Barmouth (149)

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Map reference SN 6590 1110
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, E61964

Plane Polarized, E61964

Plane Polarized, E61964