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Black Materia is pretty much the Gun to end the World and Sephiroth was the one meant to pull the Trigger. burning_eyes thats Pretty much wut willl happen to us if it actually was real.

isn't black materia a key item in ff7?

Couldn't have said it any better myself.

thanks, i thought it was just another materia.

Wait a second, there is a Black Materia? Well, I guess I could have paid a lot more attention to the game... Or just remembered more of it... Oh, well... Thanks for clearing it up for some people.

Materia are small spheres of crystalized spiritual energy used in the magic system of Final Fantasy VII. These spheres allow their users to cast various magics and use special abilities. The energy from which they form originates in the Lifestream a river of spiritual energy coursing through the Planet. Aside from this energy's application in the creation of materia, it can also be drawn out of the earth to be harnessed as a source of electrical energy called Mako Energy

In the game, materia (from the Latin word for "matter") is created when mako (spiritual energy from inside the Planet that rises to the surface and condenses into a liquid) crystalizes, forming an orb. Within materia reside the knowledge and memories of those who have lived and died in the past. Materia functions by acting as a conduit between its wielder and the Planet's Lifestream, allowing the memories associated with that materia to be manifested in a physical sense, what's referred to as "magic." Years before Final Fantasy VII began, the Shin-Ra Company discovered a means to manufacture materia within their mako reactors, and — recognizing its profitable potential — quickly monopolized its production and marketed it. They also outfitted their SOLDIER units with it as weaponry, quickly bringing an international war that had lasted for several years to an end.

In the postwar era to follow, the people's dependency on Shin-Ra's mako reactors and materia would allow the company to control the world. Materia can form from crystalized mako both naturally and artificially, but finding a natural source of materia is extremely rare. One such "mako fountain" exists in the mountains above Nibelheim.

The Black Materia is utilized to cast Meteor, the Ultimate Destructive Magic in Final Fantasy VII, capable of destroying an entire planet. Much of the plot in the game revolves around the pursuit of the Black Materia, both by the game's heroes (in order to safeguard it from those who would misuse it) and by the game's villain, Sephiroth (as a vehicle for his plans). The party is able to obtain the materia at the Temple of the Ancients, but main character Cloud Strife is forced to relinquish it to Sephiroth, both there, and a second time later at the Northern Crater, allowing Sephiroth to cast Meteor. Like the White Materia, the Black Materia is a major plot device and does not exist as a materia in the strictest game terms (i.e., the player cannot equip it in any menus or use it in battle), though it does appear as a "Key Item" in the Key Item inventory for a short period of the game.




We actually have a pretty clear idea of which memory the Black Materia represents. As with most materia the utilization of the memories creates some pretty amazing effects, the Black Materia can only be the memories of one of several things from prior games and movies.
Tellah from Final Fantasy 4 and his Meteor attack.
One of the prior final Boses, Most likely Kefka of FF6....
Or...

Final Fatnasy the Spirits Within's main heros or one of the main heros or villians memory of the meteor crash that brought all the monsters to earth. Could summon a meteor from the very same world that had originally been destroyed. Go figure.

Your choice on what you think from there.