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Rosasite
Rosasite is carbonate (copper-zinc), (Cu,Zn)₂(CO₃)(OH)₂. In the hand, it rates 4 to 4.5 on the Mohs scale, and it runs blue-green and turquoise. Turquoise-blue fuzzy balls dotting rusty matrix, firmer and bluer than aurichalcite's feathery turquoise tufts, often sugar-dusted with calcite.
The geology.
Rosasite carries the formula (Cu,Zn)₂(CO₃)(OH)₂. It belongs to the monoclinic system. The trade files it under carbonate (copper-zinc).
It sits at 4 to 4.5 on the Mohs scale. The surface reads silky to vitreous. Light behaviour is translucent. Specific gravity runs 4.0 to 4.2. The streak is pale blue-green. It breaks with fibrous; rounded balls.
Turquoise-blue fuzzy balls dotting rusty matrix, firmer and bluer than aurichalcite's feathery turquoise tufts, often sugar-dusted with calcite.
Common cuts are fuzzy spherical tufts, botryoidal crusts or balls on limonite with calcite.
The origins.
Oxidized copper-zinc deposits: Ojuela mine, Mapimí (Mexico, the classic), Arizona (USA), Sardinia (namesake Rosas mine).
On value, the database notes: collector mineral; rich Ojuela plates are mid-range.
Traditional associations.
In energy work traditions, rosasite has little established lore; its calm blue-green gets linked to soothing speech.
Included for completeness. Tradition is worth knowing about, and it is worth keeping separate from the mineralogy.
Spotting the real thing.
Turquoise-blue fuzzy balls dotting rusty matrix, firmer and bluer than aurichalcite's feathery turquoise tufts, often sugar-dusted with calcite.
| Looks like | How to tell them apart |
|---|---|
| Aurichalcite | Aurichalcite forms looser feathery tufts and is softer; rosasite's balls are compact |
| Malachite (botryoidal) | Malachite is grass-green; rosasite leans blue |
| Chrysocolla | Massive crusts rather than discrete fuzzy spheres |
At-home tests.
These checks cost nothing. Daylight, a 10x loupe and a little patience are the whole kit for rosasite.
| Test | What you should see |
|---|---|
| By eye | Compact fuzzy-ball habit |
| Acid check | Fizzes gently in vinegar |
| By eye | Pale blue-green streak |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
Care & handling.
At 4 to 4.5 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 fibrous; rounded balls, 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.
Copper-zinc carbonate, wash hands after handling crumbly specimens.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is (Cu,Zn)₂(CO₃)(OH)₂. Crystal system: Monoclinic. Specific gravity: 4.0 to 4.2. Streak: Pale blue-green. Cleavage and fracture: Fibrous; rounded balls.
How it reaches the market
Oxidized copper-zinc deposits: Ojuela mine, Mapimí (Mexico, the classic), Arizona (USA), Sardinia (namesake Rosas mine).
What it gets confused with
Aurichalcite: Aurichalcite forms looser feathery tufts and is softer; rosasite's balls are compact. Malachite (botryoidal): Malachite is grass-green; rosasite leans blue. Chrysocolla: Massive crusts rather than discrete fuzzy spheres.
What it is worth
Collector mineral; rich Ojuela plates are mid-range.
One more thing
Ojuela mine matrix plates, rusty brown studded with rosasite turquoise balls, are among Mexico's most recognizable collector pieces.
An education-first guide.
We do not carry rosasite. 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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