Magnesiobermanite is a rare phosphate mineral typically found as an alteration product in granite pegmatites. Collectors should look for small, yellowish tabular crystals associated with other phosphate minerals in secondary hydrothermal environments.

Hardness

3-4

Mohs

Luster

Vitreous

Streak

Pale Yellow

Transparency

Transparent

mineralrareBermanite Group family

Magnesiobermanite

Hardness: 3-4
Luster: Vitreous
Streak: Pale Yellow
Transparency: Transparent

No image

Is this magnesiobermanite?

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 magnesiobermanite with a known reference. Magnesiobermanite 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. Magnesiobermanite leaves a pale yellow streak.
3
Read the luster
Hold the specimen under a strong light. Magnesiobermanite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: yellow, brownish yellow, brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals.

Often confused with

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

Often found alongside magnesiobermanite

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

All properties

Chemical formula: MgMn³⁺₂(PO₄)₂(OH)₂·4H₂O
Mohs hardness: 3-4
Density: 2.5-2.6 g/cm³
Colors: Yellow Brownish Yellow Brown
Streak: Pale Yellow
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Granite Pegmatites
Typical price: $50-300 per specimen

Where rockhounds find magnesiobermanite

Classic worldwide localities

Tip Top mine, South Dakota, USA
Sapucaia pegmatite, Minas Gerais, Brazil

Field-hunting tip

Look in granite pegmatites country — that is the host setting where magnesiobermanite typically forms. If you start seeing triplite, rockbridgeite, triphylite 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 magnesiobermanite?+

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

Where is magnesiobermanite found?+

Notable localities include Tip Top mine, South Dakota, USA; Sapucaia pegmatite, Minas Gerais, Brazil.

How much is magnesiobermanite 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.

What rocks look like magnesiobermanite?+

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

What minerals are found with magnesiobermanite?+

Magnesiobermanite commonly co-occurs with Triplite, Rockbridgeite, Triphylite, Eosphorite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does magnesiobermanite form in?+

Magnesiobermanite typically forms in granite pegmatites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is magnesiobermanite used for?+

Magnesiobermanite is used in collector.

Find magnesiobermanite on the map

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