Leopard skin rock

Spotted while climbing up the dry creek bed towards Firefly Mine.
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Spotted while climbing up the dry creek bed towards Firefly Mine.

The gully below Firefly Mine is full of rocks that have washed down. The vast majority are your common or garden, everyday grey rocks and boulders - every now and again, though, a flash of colour catches the eye.
I am by no means a geologist or chemist, but is this colour not indicative of sulphides?