In order to further elucidate the magnetic properties of concentrated manganese aluminosilicate glasses, the specific heat of two samples containing 13.3 at.% and 14.3 at.% Mn was measured in the temperature range 2‐38 K. Below ∠50 K the susceptibility of these samples exhibits superparamagnetic type behavior which terminates in a sharp peak at 2.95 K and 4.25 K, respectively, seeming to indicate the onset of long range antiferromagnetic order. However, the specific heat does not show a cooperative‐type peak. Instead, at low temperatures, the specific heat exhibits a broad, smooth maximum approximately 10 K wide, superimposed on a nearly linear background. The specific heat result is consistent with the broad dip in the sound velocity which has been observed in these systems.1 It has previously been shown that the susceptibility and the sound velocity can be accounted for by dividing the glass in small domains (anisotropy parameter KV) and applying Néel’s theory of small magnetic particles.2 It is shown that this theory accounts for the temperature dependence of the specific heat and leads to values of KV which are in reasonable agreement with those obtained from the susceptibility and the sound velocity. The size of the domains is ∠12 Å. The net magnetic moment of the domains is about seven times smaller than the magnetic moment needed to fit the susceptibility data. No satisfactory explanation for this discrepancy is available.