Insizwaite is a rare platinum-bismuth mineral typically found as microscopic inclusions within copper-nickel sulfide ore bodies. Collectors often identify it via polished sections using reflected light microscopy, as it is rarely found in large, well-formed crystals. It is most commonly sourced from major magmatic sulfide mining districts like Insizwa or Norilsk.
Is this insizwaite?
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 insizwaite with a known reference. Insizwaite sits at Mohs 5-5.5, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: black.
- 3Read the lusterHold the specimen under a strong light. Luster: metallic.
- 4Match the color rangeCompare against the expected color range: tin white.
- 5Look at form & habitCrystal system: cubic. Typical habit: granular.
Often confused with
Insizwaite vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside insizwaite
Minerals reported to co-occur with insizwaite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- PtBi₂
- Mohs hardness
- 5-5.5
- Density
- 12.8 g/cm³
- Colors
- Streak
- Black
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Cubic
- Crystal habit
- Granular
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector, Scientific research
- Host rock
- Of hydrothermal origin, in a vein cutting massive pyrrhotite ore (Insizwa deposit, South Africa); in Cu–Ni sulfide ore (Sudbury, Canada)
Where rockhounds find insizwaite
Classic worldwide localities
- Fox Gulch, Goodnews Bay, Alaska, USA
- Insizwa Cu–Ni deposit, Waterfall Gorge, East Cape, South Africa (type locality)
- Coleman mine, Sudbury, and the Strathcona mine, Falconbridge, Ontario, Canada
- Noril’sk region, western Siberia, Russia
Field-hunting tip
Where it forms: Of hydrothermal origin, in a vein cutting massive pyrrhotite ore (Insizwa deposit, South Africa); in Cu–Ni sulfide ore (Sudbury, Canada). If you start seeing pentlandite, cubanite, hessite in float, you are in the right ground. Typical habit: granular. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify insizwaite?+
Where is insizwaite found?+
Is insizwaite safe to handle?+
What rocks look like insizwaite?+
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Find insizwaite on the map
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