the world > the earth > minerals > types of mineral > arsenates > [noun] > sulph-arsenate of iron (2)
pitticite1826
A secondary iron mineral of variable composition based on amorphous hydrous ferric arsenate, occurring as pale grey, yellowish, or reddish to dark…
pitch ore1896
(a) (more fully copper pitch ore) a dark brown ore of copper containing chrysocolla and limonite; also called pitchy copper ore; (b) = pitchblende, n.…