Like mealy bugs?

No, spider mites are tiny, barely visible to the naked eye (and if you don't have good eyesight, you may not be able to see them at all!)

That plant is definitely thirsty though.

The white spots are mineral deposits. I checked but there are no mites. Is it a sickness??

Mineral deposit is not a sickness. They are caused most often by plants watered with hard water and/or too much fertilizer. If these are constant (always watering with hard water - contains too many dissolved minerals like calcium carbonate, sodium, and iron; and over fertilizing), these could cause problems in the long run.

What white spots? I don't see any white spots in the picture. I see a weakened and sick plant that's being sucked on by sucking pests. Since you cant see them easily, and since you can see little dots of discoloration, these are all indicative of spider mites. They are very hard to see. I don't need glasses but I can't really see them in person. I identify that I have them by the symptoms they cause and treat accordingly.

The stipling mentioned in the first reply is not talking about mineral buildup. I do see mineral deposits from hard water but that can be wiped off.

I am quite sure that OP is referring to "white spots" that are quite visible, I see them best on the branch @ lower right.

OTOH, I do not see any stippling - BUT that is likely me - I would prefer clear close-up photo...What I see is limp-looking plant. It could be watering, too much or too little or roots are damaged and can't drink; or some other reason.

Yes, better pics often help. I think the stippling effect mentioned above is referring to the overall look due to lack of fullness in the leaf, jade leaves are typically plump, often shiny, juicy and ‘full’ if that’s the right word to use. These definitely look deflated, limp, weak and dull, they lack substance.

Agree there are white spots/patches lower right, correctly ID’d as mineral/water marking. Leaves appear dusty almost as if covered in that sparkly/dusty material that forms on completely dehydrated leaves.

Gill

What is that about?

What is this about?

Probably oedema - has been talked about on this forum a lot. Besides other conditions, incorrect watering - water retaining soil - pot without drainage hole can all contribute to it.

What about this guys?? Winters?or lack of water?