Crystalline salt lake nugget found at level of water table.This nugget was cleaned only briefly in an ultrasonic cleaner to remove outside mud but some'mud' still remains in the pockets.

M40x

Magnification of part of specimenB above through microscope showing clear evidence of a later secondary purer gold deposit, looks spongy but is actually microscopic gold crystals!) over massive crystalline gold.(this appears silvery due to reflection of microscope light)
Possibly a bacterially derived secondary deposit?

Photo of two ounce nugget found at depth of about one foot on salt lake (at level of water table) showing nugget surrounded by a crust of celestine/barite crystals.(see also below) It also has some chlorite on other side and as you can see at top right, also a bit of gypsum attached.

M4x

'Platy ' 'stepped' nature of this crystalline gold nugget (called specimenA here for convenience) can be seen with the naked eye.

Most of this nugget has been encrusted with crystals of celestine/barite.

specimenA 40x

A part of specimenA showing typical blocky and stepped crystalline structure for this type of salt lake nugget.

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 nuggets of this type on the salt lakes usually in the wetter areas of the salt lake!

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

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