BGS mineralogy and petrology collection record

Sample number S31139
Sample Donor Wilson, George Victor
Rock name 'Original entry: Hornnblende-Biotite Diorite, Medium- To Coarse-Grained'
Stratigraphy Not entered
Comments Diorite
Locality details Coast 0.33 mile N of Culswick Broch
50k map sheet Foula (125)

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Map reference HU 252 453
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


S31139

Cross Polarized, S31139

Plane Polarized, S31139

Plane Polarized, S31139