Nchwaningite is a rare manganese silicate mineral known for its distinctive radial, needle-like crystal sprays. It is almost exclusively found in the unique hydrothermal environments of the Kalahari Manganese Fields in South Africa, where it occurs on matrix with other manganese minerals.

Hardness

5.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Nchwaningite

Hardness: 5.5
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this nchwaningite?

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 nchwaningite with a known reference. Nchwaningite sits at Mohs 5.5, 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 brown.
5
Look at form & habit
Crystal system: orthorhombic. Typical habit: acicular, radial, spherical.

Often confused with

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

Often found alongside nchwaningite

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

All properties

Chemical formula: Mn²⁺₂SiO₃(OH)₂·H₂O
Mohs hardness: 5.5
Density: 3.19 g/cm³
Colors: Light brown
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Orthorhombic
Crystal habit: Acicular, radial, spherical
Cleavage: Perfect on {100}; perfect on {010}
Rarity: Rare
Uses: Collector
Host rock: In a vug in manganese ore

Where rockhounds find nchwaningite

Classic worldwide localities

The N,chwaning II Mine, Kalahari Manganese Field, Northern Cape Province, Republic of South Africa (type locality)

Field-hunting tip

Where it forms: In a vug in manganese ore. If you start seeing hausmannite, bixbyite, sturmanite in float, you are in the right ground. Typical habit: acicular, radial, spherical. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify nchwaningite?+

Mohs hardness is 5.5. Luster: vitreous. The streak is white. Common colors include light brown.

Where is nchwaningite found?+

Notable localities include The N,chwaning II Mine, Kalahari Manganese Field, Northern Cape Province, Republic of South Africa (type locality).

What rocks look like nchwaningite?+

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

What minerals are found with nchwaningite?+

Nchwaningite commonly co-occurs with Hausmannite, Bixbyite, Sturmanite, Manganite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does nchwaningite form in?+

Where it forms: In a vug in manganese ore. Working float back to the host body is the standard way to chase a fresh occurrence.

What is nchwaningite used for?+

Nchwaningite is used in collector.

Find nchwaningite on the map

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