[Glorantha] Truestone capacity

OK, so using the RQ3 model, of virgin truestone that can take one and only one dose of divine magic, what becomes of it if a piece of "charged" truestone is broken into two or more pieces? Does each fragment retain all the stored spells? Or are they split between the fragments, or the larger piece retain the stored spells and the smaller bit is blank, or does it mess up the whole thing? Or what?

• Curious of Leighton Buzzard.