A little rounded 'seed' nugget  about 8mm diameter which is nearly completely enclosed in the celestine/ barite deposit which seems to protect the crystalline surface. Blocky nature of gold can be seen.
I have found many small rounded high purity nuggets of this type on the salt lakes usually in the wetter areas of the salt lake!

A typical small salt lake nugget with its usual celestine/barite coating sometimes I have called this 'calcrete' which is technically wrong as it is not a carbonate but an insoluble sulphate. The crystalline gold structure is hard to see with the naked eye but by the sparkly, reflectiveness of the gold it is obvious that the gold is crystalline and under a microscope shows the same sharp blocky layered structure.

A long wedge shaped nugget which had a deposit (barium/strontium sulphate) on the sides which was removed using an ultrasonic cleaner. After removal of the deposit a 'crystalline' surface was revealed. 

The 'blocky' nature of this seed type nugget is obvious to the naked eye. This nugget was found as shown in shallower lake sediments and has probably been a bit more  'weathered'.

Close up under magnification (below) shows the crystalline structure of the nugget which will be even better preserved beneath the deposit.