J.S. Mason - Central Wales Orefield: Tucekite's distinctinctive anisotropy

Tucekite 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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