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How does stibnite occur in granite and gneiss?

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A labeled periodic table entry for antimony shows its symbol Sb, atomic number 51, atomic weight 121.76, electron configuration, and name. It is a solid, weakly acidic other metal with a rhombohedral crystal structure at room temperature. — antimony Properties of antimony.

Stibnite, which is the principal ore of antimony, occurs in massive forms within granite and gneiss. While the mineral is found in these rock types, it is also known to occur in limestone, where it is believed to have been deposited by hot springs.1