Olivine is a precious gemstone which occurs in basalt, peridotite and other basic igneous rocks. It has an olive-green, grey-green appearance.

Unearth a family activity with a difference: crystal fossicking. Mount Shadwell Quarry at Mortlake allows fossicking for olivine, an olive-green, grey-green, or brown mineral found in basalt, peridotite, and other igneous rocks. Large volcano-ejected rocks, known as volcanic bombs, can contain olivine and make for a fun treasure hunt and very unusual souvenirs. Meeting point for the Fossicking is located at Mount Shadwell Quarry. - Next Available Dates: Open 10:00am to 4:00pm on the following dates - *** 20 June, 4 July, 12 July, 1 August, 9 August,15 August, 5 September, 13 September, 19 September, 3 October, 11 October, 7 November, 15 November, 21 November, 5 December, 13 December, 19 December...