Now, with Skyrim, we actually have some confirmation of how you find soul gems - they grow in geode clusters. Presumably, this means that soul gems really are crystals that grow over time in specific conditions.
So then, my question is, how industrialized is this? Are the soul gems you purchase in stores the results of a mining expedition, or is it possible to just make a basemant in the local wizard's guild where you pour the right alchemical concoction on the right types of rocks in the right controlled atmosphere to "farm" some soul gems?
Are they supposed to take days to grow in the right circumstances? Years? Centuries?
Or else should I introduce mining companies that search for veins of naturally-occuring sources of the stuff? Considering that recharging already-existing magic items requires a ready supply of soul gems with a huge turnover rate, would that even be capable of supplying the rate of use that Tamriel has for soul gems?
Are they related at all to Welkynd stones, which apparently grow naturally, http://www.uesp.net/wiki/Oblivion:No_Stone_Unturned quest? If so, would it be feasible inside of the bounds of lore to have a mod where the College is actually working on trying to grow their own "farm" for soul gems and possibly even researching welkynd stones?
With these things, would it be lore-friendly to have an in-game industry selling magical fuel-less light sources based off of welkynd stones, or else simple Rods of Candlelight? I find it highly suspicious that the torches and braziers set in an ancient Nordic/Nedic ruin would still be burning if nobody has apparently been here to disturb those ruins in thousands of years, and a perma-magic lightsource would make much more plot sense.
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To take this onto a related subject of which I have an interest, I wonder about the mechanics of souls that are in soul gems, as well.
A huge number of contradictory things can happen to a soul of a dead creature in Nirn, but what part of a soul still exists when it is has been used as a battery for a sword with a fire enchantment, exactly?
When I read lore about souls being created out of a cosmic soul-stuff, and potentially even returning to that, it reminds me of some reincarnation concepts. I also wonder about the notion of some things like a difference between an "Immortal Soul" and a "Mortal Soul". Even in the Abrahamic tradition of religion and view on souls, there is an Immoral and mortal soul, where the immortal soul passes on, but the mortal soul will die with the body, and return to the Earth, where it can be made into another mortal soul at some other point in time.
In Touhou, for an extreme (and generally mostly comical) example, living in the Buddhist version of the Netherworld, there is a girl named Youmu Konpaku who comes from a family of half-human, half-ghosts. Her regular physical form contains only her mortal soul, while she also has a "ghost" half of herself that flies around beside her with semi-autonomy that is actually her immortal soul. The two are separable enough that her immortal soul ghost half is capable of attacking or casting spells on its own, and Youmu can even use a higher-level power that lets her soul substantiate into another physical form so that she can team up with her own ghost.
What is the possibility of there being this mortal/immortal dichotomy in TES lore, and would that potentially mean that a soul gem fills only with the mortal soul, while the immortal soul still passes on? For example, when I play Oblivion, they talk about the immortality of a daedra, where their immortal soul causes them to keep being reborn (but temporarily weakened, as though they are an immortal soul that needs to re-accumulate something else to be respawned) but then, I frequently summoned daedra to soul trap and kill at my own convenience whenever I needed to fill up my soul gems for some enchanting. Is a Xivlai that I summon, soul trap, kill, and use in an enchantment actually permanently dead for my having done that, or have I simply taken a more-than-usual portion of its mortal soul, while its immortal soul goes back to Oblivion?
If this is the case, where normal soul use and enchantment actually only consumes the portion of the soul that would die and return to the great lifestream or whatever, then it substantially changes the narrative on how moral or immoral the use of soul gems are. Even if we set aside the notion of black soul gems, in a world where you are permanently destroying the immortal soul of a bunny rabbit because you wanted to recharge your sword's fire bits, you're a horrible monster. Conversely, a mortal/immortal soul idea would mean that you are only delaying the dissolusion of a portion of the soul that does not entirely contain the true nature of a being. It would be like eating an animal's corpse and then letting it decay, or taxidermy for more permanent enchantments, rather than simply letting an animal's body decay and return to soil to re-enter the material cycle of life and death.
*sigh* I suppose this is a bit too much of a rambling series of questions for my own good, but I hope some people could help point me to some good answers on these questions.