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.
Is this nchwaningite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch nchwaningite with a known reference. Nchwaningite sits at Mohs 4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Nchwaningite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Nchwaningite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: brown, yellow-brown.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: acicular or fibrous radial sprays.
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
- 4
- Density
- 3.1 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Orthorhombic
- Crystal habit
- Acicular or Fibrous Radial Sprays
- Cleavage
- Good
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Hydrothermal Manganese Deposits
- Typical price
- $50-500 depending on specimen quality and size
Where rockhounds find nchwaningite
Classic worldwide localities
- N'Chwaning Mines, Kalahari Manganese Fields, South Africa
Field-hunting tip
Look in hydrothermal manganese deposits country — that is the host setting where nchwaningite typically forms. If you start seeing hausmannite, bixbyite, sturmanite in float, you are in the right ground. Field specimens usually show a acicular or fibrous radial sprays habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find nchwaningite on the map
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