def Mg2SiO4(mw_atmos, mh=1):
    """Defines properties for Mg2SiO4 as condensible"""
    if mh != 1:
        raise Exception(
            'Alert: No M/H Dependence in Mg2SiO4 Routine. Consult your local theorist to determine next steps.'
            )
    gas_mw = 140.7
    gas_mmr = 7.1625e-05 / 2 * (gas_mw / mw_atmos)
    rho_p = 3.214
    return gas_mw, gas_mmr, rho_p
