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.[2] It was specified to refer to specimens with a Ni:Mg ratio of 1:2 in 2024.[1]

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