Answer:
It's in your hand though you can not feel it. Only you and time can reveal it.
Glittering points that downward thrust. Sparkling spears that never rust.
Left to right Iβm quite bright. Right to left I might bite.
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' & my last three letters are a metal. Who am I?
In the evening I'm long, in the morning I'm smallΝΎ When seen in a ballroom, I'm nothing at all.
What is so fragile that saying its name breaks it?