Definitions

1. noun

A rare mineral consisting of sodium iron arsenate. It is a secondary mineral found in iron ore deposits and has been known to occur in hydrothermal veins.

“The geologist carefully analyzed the fergusite samples to understand its chemical composition.”

2. noun

A rare mineral species consisting of a sodium iron arsenate. It is relatively uncommon, yet it has gained interest among mineral collectors.

“Fergusite is a valuable addition to any mineral collection due to its unique composition and scarcity.”