"The Star Martial Rule" is an alchemical term that refers to a particular form of antimony, obtained by a process involving iron (Mars) and characterized by its star-shaped crystallization. It is considered an important stage in alchemical work, potentially leading to Philosophical Gold.
It is also associated with the "mystical conjunction of the path of antimony in the sacerdotal path," suggesting a spiritual or mystical dimension in its use.
Rule: In alchemy, "rule" refers to the pure part of a metal obtained from melting ores, often metallic sulphides.
Martial: The term "martial" refers to iron, a metal associated with Mars in alchemy, and indicates that the process of extraction involves iron.
Starred: Star-shaped crystallization is a distinctive visual feature of the obtained rule, hence the name "star".
