alabandite

{{Infobox mineral | name = Alabandite | category = Sulfide mineral | image = 2461M-alabandite1.jpg | alt = | caption = Group of octahedral alabandite crystals partially coated with pink rhodochrosite, from Uchucchacua Mine, Oyon, Lima, Peru (size: 60 mm × 59 mm × 46 mm, 204 g) | formula = MnS |IMAsymbol=Abd | molweight = | strunz = 2.CD.10 (10 ed) II/C.15-30 (8 ed) | dana = 2.8.1.4 | system = Cubic | class = Hexoctahedral (mm) H-M symbol: (4/m 2/m) | symmetry = Fmm | unit cell = a = 5.2236 Å; Z = 4 | color = black, steelgray, brownish-black | habit = mostly massive or granular; cubic or octahedral crystals to 1 cm | twinning = Lamellar || {111} | cleavage = Perfect on {100} | fracture = Irregular, uneven | tenacity = Brittle | mohs = 3.5 to 4 | luster = Sub-metallic | streak = Green | diaphaneity = Opaque, translucent in thin fragments | gravity = 4.053 | density = | polish = | opticalprop = Isotropic | refractive = n = 2.70 | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = }}

Alabandite or alabandine, formerly known as manganese blende or bluemenbachite is a rarely occurring manganese sulfide mineral. It crystallizes in the cubic crystal system with the chemical composition Mn2+S and develops commonly massive to granular aggregates, but rarely also cubic or octahedral crystals to 1 cm.