J.S. Mason - Central Wales
Orefield: Tucekite's distinctinctive anisotropy
crystals associated with galena and chalcopyrite from Eaglebrook Mine,
Central Wales, viewed under crossed polars.
The blue image shows the tucekite close to its extinction position.
White is obtained by rotating the analyser 8 degrees clockwise, while
to get red do the same, but anticlockwise.
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