One possible explanation for the rapid development of antiferromagnetism in the system MnCr2S4&sngbnd;MnInCrS4is the existence of antiferromagnetic interactions among theA‐site Mn. The normal spinel MnSc2S4was prepared and studied to determine the actual magnitude ofA‐Ainteractions in sulfide spinels. The cubic lattice parameter isa=10.615 Å withu=0.381. Magnetic susceptibility measurements showed this material to be an antiferromagnet with a Ne´el temperature below 4.2°K and with a &thgr;‐parameter of about −21°K. The magnitude of the Mn&sngbnd;Mn exchange interaction was determined by fitting the susceptibility data from 15° to 295°K to the [3, 3] Pade´ approximant to the Rushbrooke‐ Wood series expansion. The value of the Mn&sngbnd;Mn exchange constant was found to beJ/k=−0.80°K. The use of Pade´ approximants rather than the truncated series itself greatly improves the applicability of the power series expansions at temperatures comparable to or below the value of the &thgr;‐parameter.