Betpakdalite-FeFe is a rare secondary mineral typically found in the weathered oxidation zones of ore bodies rich in molybdenum and arsenic. It generally presents as distinct yellow or orange powdery crusts or coatings on host rocks like quartz or iron oxides. Collectors often seek it out for its specific type-locality significance and its formation in complex supergene environments.

Hardness

2-3

Mohs

Transparency

Translucent

mineralrareBetpakdalite Group family

Betpakdalite-FeFe

Hardness: 2-3
Transparency: Translucent

No image

Is this betpakdalite-fefe?

2-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 betpakdalite-fefe with a known reference. Betpakdalite-FeFe sits at Mohs 2-3, softer than the next harder reference, harder than the previous one.
2
Look at form & habit
Crystal system: monoclinic. Typical habit: crusts, powdery coatings, microcrystalline aggregates.

Often confused with

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

Often found alongside betpakdalite-fefe

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

All properties

Chemical formula: [Fe₂(H₂O)₁₅(OH)₂Fe(H₂O)₆][Mo₈As₂Fe₃O₃₇]
Mohs hardness: 2-3
Density: 3.5-3.8 g/cm³
Transparency: Translucent
Crystal system: Monoclinic
Crystal habit: Crusts, powdery coatings, microcrystalline aggregates
Rarity: Rare
Uses: Collector

Where rockhounds find betpakdalite-fefe

Classic worldwide localities

Mt. Moliagul, ~200 km northwest of Melbourne and 58 km west of Bendigo, Victoria, Australia

Field-hunting tip

If you start seeing molybdenite, goethite, quartz in float, you are in the right ground. Typical habit: crusts, powdery coatings, microcrystalline aggregates. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify betpakdalite-fefe?+

Mohs hardness is 2-3.

Where is betpakdalite-fefe found?+

Notable localities include Mt. Moliagul, ~200 km northwest of Melbourne and 58 km west of Bendigo, Victoria, Australia.

Is betpakdalite-fefe safe to handle?+

Betpakdalite-FeFe contains arsenic and calls for real care. Contains arsenic, which is toxic. Handle with care, avoid creating dust, and wash hands thoroughly after handling.

What rocks look like betpakdalite-fefe?+

Betpakdalite-FeFe is most often confused with Ferrimolybdite, Mopungite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with betpakdalite-fefe?+

Betpakdalite-FeFe commonly co-occurs with Molybdenite, Goethite, Quartz, Arsenopyrite. Spotting any of these in float or country rock is a useful trip signal.

What is betpakdalite-fefe used for?+

Betpakdalite-FeFe is used in collector.

Find betpakdalite-fefe on the map

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