Lyric from Green Day's song "2000 Light Years Away"
Malachite is a green gemstone, and Billie Joe's eyes are green. What he means is that this girl can stare deeply into his green eyes, and fall in love with him.
She holds my malachite so tight, so never let go
Another word for dick.
She holds my malachite
so tight so never let go
'Cause she's 2000 light years away
~2000 Light Years Away, by Green Day