Hey mate,
im a geologist with a fair amount of copper experience and i've also fossicked at the AGHA KHAN emerald deposit.
that is 100% definitely not emerald. no question at all.
i have a collection of minerals very similar to this and i would have to agree with SWright that you have found either atacamite (less likely) or pseudo malachite.
there is no need to ruin your specimen by testing it for copper.
also, there is a large deposit in boddington which is a copper/gold occurrence so regionally (part of the Yilgarn Archean cratonic suite) it totally makes sense to find small amounts of copper around the wheat-belt.
may i ask where you found it (regionally, not necessarily specifically)?
cheers,
Levi.