A micromineral specimen of pale blue thin prismatic crystals labelled as aurichalcite in cuprite from Gertraudi, Brixlegg, Kufstein District, Tyrol, Austria. It is possible that this is not aurichalcite, but a copper sulphate of some sort. Nice crystals regardless. There are small darker blue crystals that could be langite which would support this. One that needs some investigation. Width of view is 5.75mm.