BGS mineralogy and petrology collection record

Sample number E491
Sample Donor Ramsey,Professor
Rock name Rhyolite. 'Original entry: Rhyolite'
Stratigraphy Not entered
Comments Not entered
Locality details Llanberis Pass, 200 yds higher up than Pass of Pont y Cromleck
50k map sheet Bangor (106)

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Map reference
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, E491

Plane Polarized, E491

Plane Polarized, E491