Question on iron sand and gold dust

[sage1999]

How did the third kazekage get the IRON in Iron Sand. Is it just like, floating around in air or what?(same for gold dust). Also, how versatile do you think it is. I mean, I wrote "iron sand" in google and got this link

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. . What do u guys think?

 

[Silent Zetsu]

Magnetism KG.

 

[~Puppet Master~]

The Third Kazekage could turn his chakra into magnetism, he used iron powder "iron sand" to freely manipulate it like Gaara.

 

[Prime Rib]

He mix his kkg with iron powder