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Baryte in Thin Section

This is a thin section of  radial growths of Baryte (or Heavy Spar).

This slide shows plumose (literally like feathers) interference structure.

In thin-section it is similar to other sulphates but can be distinguished by its straight extinction, moderately high relief, small 2V and paragenesis.

  • Crystals are often intergrown, rosettes, as demonstrated in this TS.
  • Four cleavage directions.
  • Interference colors rangeup to first-order yellow.
  • Sometimes pale colors-brown in PPL with weak pleochroism.

Collected from a mineral vein in the Hope Valley, near Castleton, Derbyshire.

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