We attended this trip with other members of the Essendon Gem and Lapidary club.
Olivine, or Peridot, occurs within scoria bombs that must be opened first. The quality of the find varies from none to gem quality with the latter being rare. The act of opening the rock, with a small hammer, renders much of what you find shattered. We had a great day and our one and only cutter was a small piece that Bianca found whilst specking the ground. I will try to get it cut for her but the size of it is currently beyond my skill.
Overall we had a great day and i think everyone came away with something.