Adularia

Description

This specimen features numerous adularia crystals grown over a silvery mineral, possibly stilbite. Adularia is among the most common minerals found in alpine pockets, alongside quartz and chlorite. Though historically regarded as an individual mineral, adularia is now classified as a variety of the potassium feldspar orthoclase. Typically white and opaque, adularia can also appear partially clear and may exhibit a slight moonstone sheen. This particular specimen was collected by Andreas Jurt in Aarau, Switzerland, in 1976 and serves as an excellent example from the locality. -- D Joyce Minerals

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