Laurite

General
Category| Sulfide mineral
Formula
(repeating unit)| RuS2
Strunz classification| 2.EB.05a
Crystal system| Cubic
Crystal class| Diploidal (m3)
H-M symbol: (P 2/m 3)
Space group| Pa3
Unit cell| a = 5.61 Å; Z = 4
Structure

Crystal structure of Laurite
S Ru
Identification
Color| Iron-black; white to gray or bluish in polished section
Crystal habit| As octahedral, cubic, and pyritohedral crystals or as rounded grains and inclusions
Cleavage| Perfect on {111}
Fracture| Subconchoidal
Tenacity| Brittle
Mohs scale hardness| 7.5
|re|er}}| Metallic
Streak| Dark gray
Diaphaneity| Opaque
Specific gravity| 6.43
Density| 6.43 g/cm3 (Measured) 6.39 g/cm3 (Calculated)
Optical properties| Isotropic and opaque
References| [1][2][3]

Laurite is an opaque black, metallic ruthenium sulfide mineral with formula: RuS2. It crystallizes in the isometric system. It is in the pyrite structural group. Though it's been found in many localities worldwide, it is extremely rare.

Laurite has a Mohs hardness of 7.5 and a specific gravity of 6.43. It can contain osmium, rhodium, iridium, and iron substituting for the ruthenium.[2] The sulfur is present as the disulfide ion, S2−
2, so the ruthenium is in the Ru(II) oxidation state.[4]

## Discovery and occurrence

It was discovered in 1866 in Borneo, Malaysia and named for Laurie, the wife of Charles A. Joy, an American chemist.[2] It occurs in ultramafic magmatic cumulate deposits and sedimentary placer deposits derived from them. It occurs associated with cooperite, braggite, sperrylite, other minerals of the platinum group elements and chromite.[1]

Synthetic RuS2 is a highly active catalyst for hydrodesulfurization.[5]

## References

1. ↑ 1.0 1.1 Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Laurite". Mineral Data Publishing. http://www.handbookofmineralogy.org/pdfs/laurite.pdf.
2. ↑ 2.0 2.1 2.2 Laurite, MinDat.org, http://www.mindat.org/show.php?id=2344
3. ↑ "Laurite Mineral Data". http://www.webmineral.com/data/Laurite.shtml.
4. ↑ Cocco, R.A.; Tatarchuk, B.J. (1989). "Effects of presulfidization on the selectivity and surface structure of ruthenium catalysts". Langmuir 5 (6): 1309–1315. doi:10.1021/la00090a005. https://pubs.acs.org/doi/pdf/10.1021/la00090a005. Retrieved 20 June 2022.
5. ↑ Chianelli, R. R.; Berhault, G.; Raybaud, P.; Kasztelan, S.; Hafner, J.; Toulhoat, H. (2002). "Periodic Trends in Hydrodesulfurization: in Support of the Sabatier Principle". Appl. Catal., A 227 (1–2): 83–96. doi:10.1016/S0926-860X(01)00924-3.

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Sulfides

| H2S
H2S2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | He

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Li2S | BeS |  |  |  |  |  |  |  |  |  |  | B2S3 | CS2
COS | (NH4)SH | O | F | Ne
Na2S
Na2Sx | MgS |  |  |  |  |  |  |  |  |  |  | Al2S3 | SiS
SiS2 | PxSy | S | Cl | Ar
K2S | CaS | Sc2S3 | TiS2 | V | CrS
Cr2S3 | MnS
MnS2 | FeS
Fe3S4 | CoS | NiS | Cu2S
CuS | ZnS | GaS
Ga2S3 | GeS
GeS2 | As2S3
As4S3 | SeS2 | Br | Kr
Rb2S | SrS | Y2S3 | ZrS2 | NbS2 | MoS2 | Tc | Ru | Rh2S3 | PdS | Ag2S | CdS | In2S3 | SnS
SnS2 | Sb2S3
Sb2S5 | TeS2 | I | Xe
Cs2S | BaS | *  | HfS2 | TaS2 | WS2
WS3 | ReS2
Re2S7 | Os | Ir2S3
IrS2 | PtS
PtS2 | Au2S
Au2S3 | HgS | Tl2S | PbS
PbS2 | Bi2S3 | Po | At | Rn
Fr | Ra | **  | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |  |  |  |  |  |  |  |
|  | ↓ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| * | La2S3 | CeS
Ce2S3 | Pr2S3 | Nd2S3 | Pm2S3 | SmS
Sm2S3 | Eu2S3 | Gd2S3 | Tb2S3 | Dy2S3 | Ho2S3 | Er2S3 | Tm2S3 | Yb2S3 | Lu2S3 |
| ** | Ac | ThS2 | Pa | US2 | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |

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