pyritous

/ˈpaɪrɪtəs/
adjective
  1. Containing or resembling pyrite; pyritic.
    • The old mining report mentioned a pyritous deposit that was not worth extracting.
    • Farmers tested the soil and found it to be pyritous, which explained the poor crop growth.
    • The pyritous veins in the cliff face glittered in the sunlight.
Synonyms