BGS mineralogy and petrology collection record

Sample number S13381
Sample Donor Wright, William Bourke (only Wright in Survey before 1935, prob. same as H B Wright above)
Rock name 'Original entry: Siliceous Breccia'
Stratigraphy Not entered
Comments Ultimate matrix of quartz with minute white mica and chlorite; breccia marginal to syenite
Locality details Port Easdail, Kiloran Bay, Colonsay
50k map sheet Colonsay (35)

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Map reference NR 4048 9831
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


S13381

Cross Polarized, S13381

Plane Polarized, S13381

Plane Polarized, S13381