I think Grima knew exactly what it was. Well, not exactly. But he knew it was a great matter of impotance. I believe Gandalf said something about how Grima could not decide who he was more mad at, Saruman or Gandalf. He threw the stone at the window narrowly missing Gandalf's head, yet it was so precious to Saruman. He wanted to hit Gandalf and hurt Saruman. So fortunately for him, he found a way to hurt them both. Unfortunately, he missed Gandalf's head.
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