Laurite

(repeating unit)RuS₂Strunz classification2.EB.05aCrystal systemCubicCrystal classDiploidal (m3)
H-M symbol: (P 2/m 3)Space groupPa3Unit cella = 5.61 Å; Z = 4Structure

Crystal structure of Laurite
S RuIdentificationColorIron-black; white to gray or bluish in polished sectionCrystal habitAs octahedral, cubic, and pyritohedral crystals or as rounded grains and inclusionsCleavagePerfect on {111}FractureSubconchoidalTenacityBrittleMohs scale hardness7.5LusterMetallicStreakDark grayDiaphaneityOpaqueSpecific gravity6.43Density6.43 g/cm3 (Measured) 6.39 g/cm3 (Calculated)Optical propertiesIsotropic and opaqueReferences^[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

^ ^a ^b Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Laurite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 14 March 2022.
^ ^a ^b ^c Laurite, Mindat.org
^ "Laurite Mineral Data". Webmineral.com.
^ 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. Retrieved 20 June 2022.
^ 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.