"Magical" weapons and armor question.

[BigJMoney]

I'm a bit confused as to what constitutes a magical weapon and magical armor. I know that magical weapons are needed to bypass ethereal, and I've seen some spells that are negated by magical armor (such as iron bane), and I'd like to know how to use them properly.

Are all magic items considered "magical" for these purposes?

What about casting spells on allies? If I cast Marble Warriors, are my troops now wearing "magical" armor? If I cast Weapons of Sharpness, are my troops now wielding "magical" weapons?

=$= Big J Money =$=