Niahite is a rare phosphate mineral found as tiny, needle-like crystals in guano-rich cave environments. It is best identified through its association with other secondary phosphates in cave deposits and is primarily valued by mineral collectors for its unique origin.

Hardness

1-2

Mohs

Luster

Vitreous

Streak

White

Transparency

Semitransparent

mineralrare

Niahite

Hardness: 1-2
Luster: Vitreous
Streak: White
Transparency: Semitransparent

Is this niahite?

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 niahite with a known reference. Niahite sits at Mohs 1-2, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: light orange, colorless.
5
Look at form & habit
Crystal system: orthorhombic. Typical habit: aggregates, radial.

Often confused with

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

Often found alongside niahite

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

All properties

Chemical formula: (NH₄)Mn(PO₄)·H₂O
Mohs hardness: 1-2
Density: 2.39 g/cm³
Colors: Light orange Colorless
Streak: White
Luster: Vitreous
Transparency: Semitransparent
Crystal system: Orthorhombic
Crystal habit: Aggregates, radial
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: A rare mineral, derived from the breakdown of bat guano (Niah Great Cave, Sarawak, Malaysia)

Where rockhounds find niahite

Classic worldwide localities

Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA
Niah Great Cave, Sarawak, Malaysia
Taguchi mine, Shidara, Aichi Prefecture, Japan

Field-hunting tip

Where it forms: A rare mineral, derived from the breakdown of bat guano (Niah Great Cave, Sarawak, Malaysia). If you start seeing newberyite, collophane, hannayite in float, you are in the right ground. Typical habit: aggregates, radial. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify niahite?+

Mohs hardness is 1-2. Luster: vitreous. The streak is white. Common colors include light orange, colorless.

Where is niahite found?+

Notable localities include Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA; Niah Great Cave, Sarawak, Malaysia; Taguchi mine, Shidara, Aichi Prefecture, Japan.

What rocks look like niahite?+

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

What minerals are found with niahite?+

Niahite commonly co-occurs with Newberyite, Collophane, Hannayite, Struvite, Variscite, Sussexite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does niahite form in?+

Where it forms: A rare mineral, derived from the breakdown of bat guano (Niah Great Cave, Sarawak, Malaysia). Working float back to the host body is the standard way to chase a fresh occurrence.

What is niahite used for?+

Niahite is used in collector.

Find niahite on the map

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