Cabrerite

Cabrerite is an arsenate mineral bearing magnesium and nickel. It is a member of the hörnesite-annabergite series in the vivianite group.

Cabrerite
General
Category	Arsenate minerals
Formula	NiMg2(AsO4)2·8H2O
Strunz classification	8.CE.40
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	C2/m
Unit cell	a = 10.205(1), b = 13.377(1) c = 4.7382(4) [Å]; β = 105.057(7)°; Z = 2[1]
Identification
References	[1]

The name Cabrerite has been in use for any annabergite with notable incorporation of magnesium, typically nickel remaining the dominant ion.^[2] It was specified to refer to specimens with a Ni:Mg ratio of 1:2 in 2024.^[1]