Generally I am round and often delicious, split me into two unequal sections and each will be transcendental.

Little specs floating in the air, settling on all your stuff. It'll never be truly gone, no matter how much you wipe and buff.

In pantry jars my kind resides, A pinch of me can change the tides. I bring warmth and flavor in a trice, With sugar and me, I make everything nice.

I get darker when I lose my last, but if I lose my third, I’m no longer with you. Four letters, one syllable, the smallest of the quad squad that helps you get what you need.

The first you need for your house or your car. The second can cause damage when thrown from afar. Combined it allows an arch to stand tall without cement or tar. Metaphorically it is the part of a system that is the brightest star.