Iron Grade Mineral—Calara!
Calara was an artificial mineral, in that it only existed in certain, physical conditions. First was temperature, where only at around 600 degrees Celsius does it retain solid form. Above it, the substance turns gaseous.
And below that temperature, the substance is just plain material, wherein it is incapable of interacting with Prana. It is a sort of unstable material in that its internal structure is extreme fragile.
Calara appears in a physical state resembling sheet, which is exactly an atom thick. The sheet could stretch for a theoretical infinite area. Of course, after a certain point, the slightest imperfections cause disastrous waves and collapse the structure.
