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plentiful only in some areas, just as quartzite, jasper, obsidian, etc. if you can't get it where you happen to be at, it isn't of any use.

now i wouldn't go showering a magnesium block with sparks just to be on the safe side because i said that though:D

also, many of the synthetics oroduce much more reliable sparks than natural flint as they are impregnated with magnesium

i immagine that where here a sliver of magnesium still attatched at it's base to the block which caught your spark it might ignite, thereby igniting the block. i've never heard of this happening....

the heat energy in the steel spall [your spark] would dissipate long before the block ignited. even shavings that are too coarse can be hard to light. the heat energy from the spall combined with...