Though not a zeolite, prehnite is found associated with minerals such as datolite, calcite, apophyllite, stilbite, laumontite, heulandite etc . in veins and cavities of basaltic rocks, sometimes in granites, syenites, or gneisses.
22.
Minerals encountered in xenoliths include : andradite, anhydrite, anorthite, apatite, biotite, calcite, diopside, fassaite, garnet, gypsum, ilmenite, magnetite, monazite, orthopyroxene, perovskite, plagioclase, prehnite, quartz, sphene, thorite, wilkeite, wollastonite and zircon.
23.
In the Canberra Graben and Cullarin Block, metamorphism mostly reached the upper greenschist stage, with shallow burial and temperature below 350 �C . This changed the volcanics and sediments with Duffy, and Kambah in the Laidlaw and Walker Volcanics the temperature was lower and prehnite-pumpellyite facies was achieved.
24.
Julgoldite has since been discovered in other parts of the world : Edinburgh, Scotland ( in quartz dolerite ) ( Livingstone, 1976 ) and Norilsk, Taymyr Peninsula, Russia, one of the largest nickel deposits in the world, in metamorphosed basalts and diabases associated with prehnite and laumontite ( Zolotukin et al ., 1965 ).
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