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Annabergite
Annabergite is arsenate (vivianite group), Ni₃(AsO₄)₂·8H₂O. In the hand, it rates 1.5 to 2.5 on the Mohs scale, and it runs apple green and pale green. Apple-green powdery 'bloom' coating weathered ore, the unmistakable green signal that nickel-arsenic minerals lie beneath. Oxidized nickel-arsenide veins; notable: Lavrion (Greece), Annaberg (Germany, namesake), Cobalt (Ontario, Canada).
The geology.
Annabergite carries the formula Ni₃(AsO₄)₂·8H₂O. It belongs to the monoclinic system. Catalogues list it as arsenate (vivianite group).
It sits at 1.5 to 2.5 on the Mohs scale. The surface reads pearly to dull, earthy. Light behaviour is translucent. Specific gravity runs 3.0 to 3.1. The streak is pale green. It breaks with perfect cleavage; soft crusts.
Apple-green powdery 'bloom' coating weathered ore, the unmistakable green signal that nickel-arsenic minerals lie beneath.
It reaches buyers as powdery crusts on ore, velvety coatings or rare bladed micro-crystals.
The origins.
Oxidized nickel-arsenide veins; notable: Lavrion (Greece), Annaberg (Germany, namesake), Cobalt (Ontario, Canada).
On value, the database notes: collector specimen; rich green Greek crusts are mid-range.
Traditional associations.
In energy work traditions, annabergite has little established lore; it is a collector's indicator mineral above all.
We keep this section because people ask. It sits below the geology on purpose, and none of it describes something the stone does.
Spotting the real thing.
Apple-green powdery 'bloom' coating weathered ore, the unmistakable green signal that nickel-arsenic minerals lie beneath.
| Looks like | How to tell them apart |
|---|---|
| Erythrite | Its cobalt twin is magenta-pink; the two form a color series |
| Malachite | Malachite is deeper green, banded, and fizzes in vinegar |
| Garnierite | Garnierite is a massive waxy nickel green, not a powdery surface bloom |
At-home tests.
Before anyone talks you into a lab report, these are the checks worth doing yourself on annabergite.
| Test | What you should see |
|---|---|
| By eye | Powdery green crust habit on gray ore |
| By eye | Very soft (fingernail) |
| By eye | Pale green streak |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
Care & handling.
At 1.5 to 2.5 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with perfect cleavage; soft crusts, which is worth knowing before you set it or drop it.
Skip the ultrasonic. Lukewarm water, mild soap and a soft cloth handle routine cleaning without risk.
Nickel arsenate, handle as a display specimen only, wash hands, and never powder or taste it.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is Ni₃(AsO₄)₂·8H₂O. Crystal system: Monoclinic. Specific gravity: 3.0 to 3.1. Streak: Pale green. Cleavage and fracture: Perfect cleavage; soft crusts.
How it reaches the market
Oxidized nickel-arsenide veins; notable: Lavrion (Greece), Annaberg (Germany, namesake), Cobalt (Ontario, Canada).
What it gets confused with
Erythrite: Its cobalt twin is magenta-pink; the two form a color series. Malachite: Malachite is deeper green, banded, and fizzes in vinegar. Garnierite: Garnierite is a massive waxy nickel green, not a powdery surface bloom.
What it is worth
Collector specimen; rich green Greek crusts are mid-range.
One more thing
Miners called these blooms 'nickel flowers', surface stains that guided them to ore before any chemistry existed to test it.
An education-first guide.
We do not carry annabergite. This page exists because the question comes up and the honest answer is worth writing down, whether or not there is anything here to sell you.
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