(Ca,Na)(Fe3+,Mg,Fe2+)Si2O6
Aegirine-augite is a greenish-black, bluish or yellow or orange pyroxene, with a composition between aegirine and augite. It usually occurs as prismatic crystals and can be commonly found in volcanic rocks. Aegirine-augite and aegirine can be visibly indistinguishable.
Selected Australian Occurrences:
- Found in all States and in the Northern Territory.
- As analysed specimens of yellow or green prismatic crystals around the edges of quartz xenoliths at Mount Anakie and Mount Shadwell, Victoria.
