Location of Dragon Scale

[Joolushkoo]

I feel rather silly asking this, but can someone pinpoint the precise location of the dragon scale that you need in order to change Amdusias back to human form. I have the book and the phial of blood, but when I make the run to the Blook Altar, I can't find the dragon scale.

Don't know if I needed the spoiler tag for the question, but figured I'd try to stay on the safe side.

Thanks to anyone who can tell me where to look.