BGS mineralogy and petrology collection record

Sample number S30711
Sample Donor Robertson,T.
Rock name 'Original entry: Quartz-Feldspar Porphyry, Felsite'
Stratigraphy Not entered
Comments Porphyritic acid intrusion; orthoclase with hornblende and biotite
Locality details C7. 80 yds N of NE-end of Maa Loch, Vementry
50k map sheet West Shetland ? (127)

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Map reference HU 302 604
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


S30711

Cross Polarized, S30711

Plane Polarized, S30711

Plane Polarized, S30711