BGS mineralogy and petrology collection record

Sample number S21621
Sample Donor Simpson,J.B.
Rock name 'Original entry: Hornblende-Biotite Spessartite'
Stratigraphy Not entered
Comments 2.5 ft dyke cutting Lewisian gneiss
Locality details 100 yds W of Dun
50k map sheet Tiree (42)

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Map reference NL 9717 3850
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


S21621

Cross Polarized, S21621

Plane Polarized, S21621

Plane Polarized, S21621