Definition
Skaergaardite is a rare native mineral consisting principally of palladium and copper, classified as a native alloy mineral with the idealized chemical formula PdCu.
Overview
First described in 1976, skaergaardite occurs as microscopic grains within mafic‑ultramafic intrusive bodies, most notably the Skaergaard intrusion in East Greenland. The mineral is of interest to economic geology because it represents a natural source of palladium, a metal employed in catalytic converters, electronics, and jewelry. Skaergaardite is typically found in association with other sulfide and native metal minerals such as pyrrhotite, chalcopyrite, pentlandite, and native copper.
Etymology / Origin
The name “skaergaardite” derives from the Skaergaard intrusion, the type locality where the mineral was first identified and described. The Skaergaard intrusion itself was named after the nearby Skaergaard Fjord in northeastern Greenland.
Characteristics
| Property | Description |
|---|---|
| Chemical formula | PdCu (idealized) |
| Crystal system | Cubic |
| Space group | Pm‑3m |
| Unit‑cell parameter | a ≈ 3.48 Å |
| Appearance | Metallic luster; gray‑white to silvery color; occurs as tiny grains or inclusions |
| Hardness | Approximately 4–5 on the Mohs scale |
| Density | ~9.8 g cm⁻³ |
| Optical properties | Opaque; isotropic in reflected light |
| Occurrence | Primarily in the lower parts of the Skaergaard intrusion; also reported from a few other layered mafic intrusions worldwide |
| Associated minerals | Pyrrhotite, chalcopyrite, pentlandite, native copper, magnetite, and various silicate minerals |
Related Topics
- Skaergaard intrusion – a classic layered mafic‑ultramafic complex that serves as a type locality for several rare minerals.
- Native element minerals – a mineral class comprising minerals composed of a single element or alloys of elements, such as native gold, native copper, and alloys like skaergaardite.
- Palladium ore deposits – geological settings where palladium concentrates, including magmatic sulfide deposits and layered intrusions.
- Igneous petrology – the study of the formation and crystallization of igneous rocks, providing context for the genesis of minerals like skaergaardite.
Accurate information about skaergaardite’s detailed crystallography and industrial significance is derived from peer‑reviewed mineralogical literature and the International Mineralogical Association’s (IMA) database.