Cabrerite
{{Short description|Arsenate mineral}}
{{Infobox mineral
| name = Cabrerite
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| category = Arsenate minerals
| formula = NiMg2(AsO4)2·8H2O
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| strunz = 8.CE.40
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| system = Monoclinic
| class = Prismatic (2/m)
(same H-M symbol)
| symmetry = C2/m
| unit cell = a = 10.205(1), b = 13.377(1)
c = 4.7382(4) [Å]; β = 105.057(7)°; Z = 2
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| references = [http://www.mindat.org/min-471114.html Mindat.org]
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Cabrerite is an arsenate mineral bearing magnesium and nickel. It is a member of the hörnesite-annabergite series in the vivianite group.
The name Cabrerite has been in use for any annabergite with notable incorporation of magnesium, typically nickel remaining the dominant ion.[http://www.mindat.org/min-836.html Mindat.org] It was specified to refer to specimens with a Ni:Mg ratio of 1:2 in 2024.