20D Grey mineral with a metallic lustre, used as a source of tin. I have - - - N - I - E and Google gave me CERNYITE. This gives me 22A A nut, piece of dried fruit, seed or spice coated in sugar, similar to a dragee as TOFFEE. Sarumite suggests 20D is STANNITE. What does that make 22A?
Also please, 1D Word which may precede box, gallery, iron or jacket. I have S_ O _ T _ N _.