Parascorodite
A rare secondary iron arsenate identified in 1967 on medieval Czech ore dumps — it rides along with its relative scorodite.
Intro adapted from Wikipedia (CC BY-SA).
Parascorodite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Fe³⁺(AsO₄)·2H₂O.
It crystallizes in the hexagonal crystal system (space group P-3c1).
Key properties: specific gravity 3.213; Yellowish-white streak.
IMA symbol Pscd, IMA status: approved, named in 1996.
Found as a rare secondary mineral in mine dumps, presumed to be a pre-mining weathering product of arsenopyrite (Kaňk, Czech Republic).
It is found associated with Scorodite, pitticite, bukovskýite, kaňkite, zýkaite, gypsum, jarosite, iron hydroxides (Kaňk, Czech Republic); scorodite, kaňkite, arsenic, pyrite.
Its name comes from the Greek para, for near, and the dimorphic relation to scorodite.