Finding/Calculating Thermal Conductivity of Magnesite Our research group is having a very difficult time locating anything about the thermal conductivity of $\ce{MgCO3}$. It is a pretty commonly mineral, so we were pretty surprised by this. Is any way to derive thermal conductivity from other properties of magnesium carbonate? (Magnesite)
In the dissertation of K. Kratz (2006) the following values of thermal diffusivity along the crystallographic axes of magnesite are listed:

$D_{[001]} = 6.55 ~\mathrm{mm^2\,s^{-1}}$,
$D_{[100]} = 2.38 ~\mathrm{mm^2\,s^{-1}}$,
$D_{[010]} = 2.38 ~\mathrm{mm^2\,s^{-1}}$.

Ch. Clauser and E. Huenges, Thermal Conductivity of Rocks and Minerals lists the following values for the thermal conductivity of magnesite in the temperature range from 25-100°C:

$\lambda_{\perp} = 7.32 \pm 0.57 ~\mathrm{W m^{-1} K^{-1}}$
$\lambda_{\mid} = 7.86 \pm 0.17 ~\mathrm{W m^{-1} K^{-1}}$