I don't really know if Magice has a true "origin", if you concentrate enough magick in one place and place it under the right conditions, like underground, it will begin to bleed into the rock around it and in the right cases it makes Magice. Magice also isn't the only form of magickal rock, it's just the most basic and most abundant, but you still have to search pretty thoroughlky to find sufficient viens enough of it to be used and there are several different typs of magice so finding the type your after can be pretty hit-and-miss; areas around these meteorite strikes are usually in rich supply of the stuff. Magice is also just a small subcategory of the "Arcane Geoforms", natural occuring rock that has magickal power and a myriad of different abilities. As for use, Magice is more used as an energy source as all it seems to do is contain and release magick. I could write a whole textbook on the laws of magick and the properties of arcane geoforms but I won't bore you.

-D-