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Plate 4.3: POlassium feldspar (yellow stain) showing typical 'patches' of albite (pink<br />

stain). Lower Head Fonnation. Plane polarised light. X31O.<br />

Plate 4.4: Rounded microcline displaying uneven extinction as a result of internal patches<br />

of albite. Lower Head Fonnation. Crossed Polars. XlOO.

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