<Dl> <Dd> SiO <45% </Dd> <Dd> Fe--Mg> 8% up to 32% MgO </Dd> <Dd> Temperature: up to 1500 ° C </Dd> <Dd> Viscosity: Very Low </Dd> <Dd> Eruptive behavior: gentle or very explosive (kimberilites) </Dd> <Dd> Distribution: divergent plate boundaries, hot spots, convergent plate boundaries; komatiite and other ultramafic lavas are mostly Archean and were formed from a higher geothermal gradient and are unknown in the present </Dd> </Dl> <Dd> SiO <45% </Dd> <Dd> Fe--Mg> 8% up to 32% MgO </Dd> <Dd> Temperature: up to 1500 ° C </Dd>

Why do all minerals have such high melting points