RAW PYRITE STONE THE GOLD OF FIRE

Mayamatam (Ch. 15: Dhātuvicāra)

“Lohasya tejasaḥ sampuṣṭaṃ gr̥he śrīṃ vahan bhavet |”
Metal enhanced with fiery brilliance brings prosperity to the dwelling.

The ancient builders thus embedded metals like pyrite or brass within foundations to strengthen the Agni Kona.