Magnesiocanutite is a rare hydrous manganese arsenate mineral typically occurring as small, pale yellow tabular crystals in arid environments. It is primarily found within the highly specific oxidation zones of the Torrecillas mine in Chile. Due to its extreme rarity and arsenic content, specimens are intended strictly for advanced mineral collections.

Hardness

3-4

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareCanutite Group family

Magnesiocanutite

Hardness: 3-4
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this magnesiocanutite?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch magnesiocanutite with a known reference. Magnesiocanutite sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Magnesiocanutite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Magnesiocanutite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: yellow, pale yellow.
5
Look at form & habit
Crystal system: triclinic. Typical habit: tabular crystals.

Often confused with

Magnesiocanutite vs. its common look-alikes — and how to tell them apart in the field.

How to tell apart: Streak differs — Magnesiocanutite leaves white, Allactite leaves light brown.

Compare →

Often found alongside magnesiocanutite

Minerals reported to co-occur with magnesiocanutite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: NaMnMn₂(AsO₄)₂·2H₂O
Mohs hardness: 3-4
Density: 3.32 g/cm³
Colors: Yellow Pale Yellow
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Triclinic
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Arid Oxidation Zones of Mineral Deposits
Typical price: $100-500 per specimen

Where rockhounds find magnesiocanutite

Classic worldwide localities

Torrecillas mine, Chile

Field-hunting tip

Look in arid oxidation zones of mineral deposits country — that is the host setting where magnesiocanutite typically forms. If you start seeing gypsum, halite, thenardite in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify magnesiocanutite?+

Mohs hardness is 3-4. It typically shows a vitreous luster. The streak is white. Common colors include yellow, pale yellow.

Where is magnesiocanutite found?+

Notable localities include Torrecillas mine, Chile.

How much is magnesiocanutite worth?+

Typical asking prices fall in the range of $100-500 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is magnesiocanutite safe to handle?+

It contains toxic constituents. Contains arsenic, which is toxic if ingested, inhaled as dust, or handled without proper hygiene; wash hands thoroughly after handling. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like magnesiocanutite?+

Magnesiocanutite is most often confused with Canutite, Allactite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with magnesiocanutite?+

Magnesiocanutite commonly co-occurs with Gypsum, Halite, Thenardite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does magnesiocanutite form in?+

Magnesiocanutite typically forms in arid oxidation zones of mineral deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is magnesiocanutite used for?+

Magnesiocanutite is used in collector.

Find magnesiocanutite on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.