Hi Maggie
While I'm in Oz, just not from Victoria, I believe that this is from the Wannon Falls on the Wannon River approximately 7km west of Hamilton, Southern Grampians Shire, Victoria.
i.e.: Wannon Falls, Hamilton, Southern Grampians Shire, Victoria
The site is located in a protected State park area and collectiing is no longer permitted.
A very good reference for this is:
Phosphate Minerals of Victoria-Special publication No.3, WD Birch and DA Henry, Mineralogical Society of VIctoria, 1993
Hope that helps
Cheers
Keith