By Didier Descouens (Own work) [GFDL or CC-BY-SA-3.0-2.5-2.0-1.0], via Wikimedia Commons
Smaltite is a collectors oddity, cut only as cabochons. It is seldom seen in collections since it is not especially distinctive, with a color resembling other metallic sulfides and arsenides.
Smaltite Value
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
Smaltite Information
| Data | Value |
| Name | Smaltite |
| Is a Variety of | Skutterudite |
| Crystallography | Isometric. Crystals cubic to octahedral; massive. fine-grained. |
| Colors | Silver gray to tin white; may tarnish gray to iridescent. |
| Luster | Metallic: opaque. |
| Hardness | 5.5-6. |
| Density | ~ 6.1. |
| Cleavage | Distinct Z directions. Fracture uneven to conchoidal. Brittle. |
| Stone Sizes | Cabochons could be cut to any size from massive material. |
| Luminescence | None. |
| Formula | (Co,Ni)As3. Considered to be an arsenic-deficient Skutterudite. |
Streak: Black.
Occurrence: Occurs in medium- to high-temperature veins, with Ni and Co minerals.
California; Colorado.
Cobalt district. Ontario and British Columbia, Canada.
Chile; Switzerland: Germany.
Comments: Smaltite is a collectors oddity, cut only as cabochons. It is seldom seen in collections since it is not especially distinctive, with a color resembling other metallic sulfides and arsenides.
Name: From its use as a source of cobalt for the pigment smalt, which is blue.
