Hydroxymanganopyrochlore is a rare member of the pyrochlore group, typically found as small, dark octahedral crystals within alkaline pegmatite complexes. Due to its radioactive nature and scarcity, it is sought primarily by advanced mineral collectors focusing on complex niobate species.

Hardness

5-5.5

Mohs

Transparency

Translucent

mineralrarePyrochlore Group family

Hydroxymanganopyrochlore

Hardness: 5-5.5
Transparency: Translucent

No image

Is this hydroxymanganopyrochlore?

3-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 hydroxymanganopyrochlore with a known reference. Hydroxymanganopyrochlore sits at Mohs 5-5.5, softer than the next harder reference, harder than the previous one.
2
Match the color range
Compare against the expected color range: dark brown, black, with red reflexes.
3
Look at form & habit
Crystal system: cubic. Typical habit: octahedral.

Often confused with

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

Often found alongside hydroxymanganopyrochlore

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

All properties

Chemical formula: (Mn,Th,Na,Ca,REE)₂(Nb,Ti)₂O₆(OH)
Mohs hardness: 5-5.5
Density: 5.398 g/cm³
Colors: Dark brown BlackWith red reflexes
Transparency: Translucent
Crystal system: Cubic
Crystal habit: Octahedral
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: In small miarolitic cavities in sanidinite as a late pneumatolytic phase

Where rockhounds find hydroxymanganopyrochlore

Classic worldwide localities

Pumice quarry near Mendig, Laacher See area, Eifel, Rheinland-Pfalz, Germany

Field-hunting tip

Where it forms: In small miarolitic cavities in sanidinite as a late pneumatolytic phase. If you start seeing sanidine, nosean, biotite in float, you are in the right ground. Typical habit: octahedral. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify hydroxymanganopyrochlore?+

Mohs hardness is 5-5.5. Common colors include dark brown, black, with red reflexes.

Where is hydroxymanganopyrochlore found?+

Notable localities include Pumice quarry near Mendig, Laacher See area, Eifel, Rheinland-Pfalz, Germany.

Is hydroxymanganopyrochlore safe to handle?+

Hydroxymanganopyrochlore contains uranium or thorium and calls for real care. Contains radioactive elements and potential heavy metals. Handle with care, avoid dust inhalation, and store in a shielded container.

What rocks look like hydroxymanganopyrochlore?+

Hydroxymanganopyrochlore is most often confused with Pyrochlore. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with hydroxymanganopyrochlore?+

Hydroxymanganopyrochlore commonly co-occurs with Sanidine, Nosean, Biotite, Tephroite, Jacobsite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does hydroxymanganopyrochlore form in?+

Where it forms: In small miarolitic cavities in sanidinite as a late pneumatolytic phase. Working float back to the host body is the standard way to chase a fresh occurrence.

What is hydroxymanganopyrochlore used for?+

Hydroxymanganopyrochlore is used in collector.

Find hydroxymanganopyrochlore on the map

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