dichroscope

/ ˈdaɪkrəˌskəʊp; ˌdaɪkrəˈskɒpɪk /

noun

an instrument for investigating the dichroism of solutions or crystals Also calleddichroiscopedichrooscope

C19: from Greek dikhroos two-coloured + -scope

The emerald is dichroic, giving in the dichroscope a bluish-green and a yellowish-green image.

The student should, if possible, obtain the use of a dichroscope and practice with it on all sorts of stones.

The use of a dichroscope would have saved them that error, for the stone is singly refracting.

The stone was therefore inspected with the dichroscope and found to possess no dichroism.

The difference was so marked as to be easily seen without the dichroscope.

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