You'll often see me within a school. You'll find me in water but never a pool. My colours are pretty, and really quite cool. The rod how I hate it! Detestable tool!

I make measurable value for every serving, but I do not make lighter unless you cut me daily. People often struggle controlling me.

Some have one pair, some have two. I smell with no nose, taste with no mouth, touch with no hands, it's true! I'm in love with molecules, a most complex tool Stabilizer, a compass, temperature, what can't I do? Some use me to swim in the deep blue.

Something that directs your attention here, it's tactile and its purpose clear. Yet should this noun be in dispute, it can change to a verb for legal pursuit.

First I was water, and you were my muse, On warm, windless days you'd admire the views, And then I was mineral, metal or stone, With oil and flint, you were never alone