Derek Christensen
Derek Christensen asked Andrew Rowe:

This question contains spoilers… (view spoiler)

Andrew Rowe A "standard" stone for each level is equal to the minimum mana requirement for that level. Since Quartz does not have a mana requirement, the standard of measurement for Quartz is 10.

So:
* Standard Quartz - 10
* Standard Carnelian - 60
* Standard Sunstone - 360
* Etc.

Making a mana crystal is much, much harder than simply enchanting a rune at the same level. It's basically a whole additional set that someone needs to develop if they want to study that discipline.

As of the second book, Corin is massively above average in his mana manipulation ability for his age. This is clearest in the final exam for that class.

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