Any basalt rock dust will do fine. Palagonite rock dust is pretty damn good and there are a few others around check enfield pet and garden online.
Americans use azomite because its mined in utah and easily avilable and cheap to transport, pretty expensive if your in Australia and probably not worth your money because of that. If you have a listen to clackamas coot and his soil mix convos there is a great wealth of info and will always advise to source ingredients locally.
currently running a mix on a different species (dont know if its helpful) which is: neem cake, rock dust, kelp, coco, spent coffee grinds, gypsum, calcium carbonate, malted barley grain and am having amazing results so far. wish I had some good quality worm castings available and is all im missing really. As said before great for the worms or compost too, even better, use the whole fruiting block once your finished!