| Rheniite | |
|---|---|
 Rheniite on basalt from the Kudriavy Volcano, Kurile Islands | |
| General | |
| Category | Sulfide mineral |
| Formula | ReS2 |
| IMA symbol | Rhn[1] |
| Strunz classification | 2.EB.35 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (sameH-M symbol) |
| Space group | P1 |
| Unit cell | a = 6.47 Å, b = 6.368 Å c = 6.401 Å; α = 105° β = 91.59°, γ = 118.9°; Z = 4 |
| Identification | |
| Color | Black, red translucent |
| Crystal habit | Platey |
| Luster | Metallic |
| Streak | Black |
| Diaphaneity | Opaque, translucent in thin fragments |
| References | [2][3] |
Rheniite is a very rarerheniumsulfide mineral with the chemical formula (ReS2). It forms metallic, silver grey platey crystals in thetriclinic - pinacoidal class.[2] It has aspecific gravity of 7.5.
It was discovered at theKudriavy Volcano,Iturup Island in theKurile Islands,Russia and approved in 2004.[4] It is found in active hotfumaroles on thevolcano.
Rheniite is one of the first minerals of the element rhenium to be found. The other known approved rhenium mineral is the sulfide mineraltarkianite. Almost all commercially mined rhenium is retrieved as a by-product ofmolybdenum mining as rhenium occurs in amounts up to 0.2% in the mineralmolybdenite. A discredited rhenium sulfide known aszappinite does not appear to be valid.
Rheniite has also been reported in the Pagoni Rachi Mo–Cu–Te–Ag–Au deposit in northeasternGreece where it occurs with molybdenite inquartzveins associated with anepithermal system in adaciteporphyry.[5]
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