Menchettiite is a rare antimony sulfide mineral that occurs primarily as acicular or fibrous needle-like crystals. It is typically found in low-temperature hydrothermal veins, often associated with stibnite, and was originally identified in the Apuan Alps region of Italy.

Hardness

Mohs

Luster

Metallic

Streak

Black

Transparency

Opaque

mineralrareStibnite Group family

Menchettiite

Hardness: 2
Luster: Metallic
Streak: Black
Transparency: Opaque

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Is this menchettiite?

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 menchettiite with a known reference. Menchettiite sits at Mohs 2, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Menchettiite leaves a black streak.
3
Read the luster
Hold the specimen under a strong light. Menchettiite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: lead-gray, black.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: acicular to fibrous aggregates.

Often confused with

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

mineral

Stibnite

Mohs 2

How to tell apart: Streak differs, so Menchettiite leaves black, Stibnite leaves lead-gray.

How to tell apart: Streak differs, so Menchettiite leaves black, Berthierite leaves dark grey.

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Often found alongside menchettiite

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

All properties

Chemical formula: MnSb₂S₄
Mohs hardness: 2
Density: 5.68 g/cm³
Colors: Lead-gray Black
Streak: Black
Luster: Metallic
Transparency: Opaque
Crystal system: Monoclinic
Crystal habit: Acicular to Fibrous Aggregates
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Hydrothermal Veins
Typical price: $50-300 per specimen

Where rockhounds find menchettiite

Classic worldwide localities

Tuscany, Italy

Field-hunting tip

Look in hydrothermal veins country, the host setting where menchettiite typically forms. If you start seeing stibnite, pyrite, calcite in float, you are in the right ground. Field specimens usually show a acicular to fibrous aggregates habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify menchettiite?+

Mohs hardness is 2. It typically shows a metallic luster. The streak is black. Common colors include lead-gray, black.

Where is menchettiite found?+

Notable localities include Tuscany, Italy.

How much is menchettiite worth?+

Typical asking prices fall in the range of $50-300 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is menchettiite safe to handle?+

It contains toxic constituents. Contains antimony and manganese; avoid inhaling dust and wash hands thoroughly after handling to prevent ingestion of toxic heavy metals. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like menchettiite?+

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

What minerals are found with menchettiite?+

Menchettiite commonly co-occurs with Stibnite, Pyrite, Calcite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does menchettiite form in?+

Menchettiite typically forms in hydrothermal veins. Working float back to the host body is the standard way to chase a fresh occurrence.

What is menchettiite used for?+

Menchettiite is used in collector.

Find menchettiite on the map

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