In my experience, also adularia can be almost uniaxial. In Oligocene
magmatic stocks from the Italian Western Alps, adularia occurs both as
euhedral crystals within hydrothermal veins and as replacement product after
magmatic K-feldspar and in part plagioclase.
Best regards
Piergiorgio
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Piergiorgio Rossetti
Dipartimento di Scienze Mineralogiche e Petrologiche
Università di Torino
via Valperga Caluso, 35
10125 Torino, Italy
Tel.: +39 011 6707107
Fax: +39 011 6707128
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