Alabandite and Pentlandite Composition, Crystallization and Structure

Alabandite 
Manganese sulphide, MnS. Isometric; tetrahedral. Usually granular massive. Cubic cleavage. H. = 3.5-4. G. = 3.95. Submetallic luster. Color iron – black, tarnished to brown on exposure. Streak olive-green. Fusible at 3. Gives odor of sulfur dioxide when roasted in O.T. Soluble in hydrochloric acid with evolution of hydrogen sulphide gas. With sodium carbonate in O.F. gives opaque greenish blue bead (manganese). A rare mineral, occurring usually with gold or silver ores.

Pentlandite
A sulphide of iron and nickel (Ni, Fe)S. Isometric. Massive granular. Octahedral cleavage. H. = 3.5-4. G. = 4.55-5. Metallic luster. Yellowish bronze color. Black streak. Fusible at 1.5-2. Gives odor of sulfur dioxide in O.T: Magnetic on heating in. R.F. Roasted mineral in O.F. colors borax bead reddish brown (nickel). Closely resembles pyrrhotite iin appearance but to be distinguished by the octahedral cleavage. A rare mineral, found with chalcopyrite near Lillehammer, Norway, and with pyrrhotite and chalcopyprite in the nickel deposits at Sudbury, Canada.

Other minerals which are rare in occurrence that belong in this group are, metacinnabarite, HgS; onofrite, Hg (S,Se); coloradoite, HgTe.

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