Formula: AlFe3(SO4)6(H2O)12 · 6H2O

Species:

Colour: Light violet to purple, Greenish white, Bluish white, Yellowish white, Brownish white

Lustre: Sub-Vitreous, Resinous, Waxy, Greasy

Hardness: 2½

Specific Gravity: 2.11

Crystal System: Trigonal

Member of: Coquimbite Group

Name: Named in 1841 by August Breithaupt for the type locality in the province of Coquimbo, Chile

Type Locality: Coquimbo – Chile

Visually indistinguishable from aluminocoquimbite. Coquimbite and paracoquimbite are structurally homeotypic.
Most (or all, if the species is truly coquimbite) samples carry Al, with variable Al:Fe ratio. It is now proved that Al is essential.