An inorganic material including SiO2, Al2O3, CaO, and Fe2O3 as components, in which the mass percentages of the components in terms of oxide in the inorganic material are set as follows: i) the total content of SiO2 and Al2O3 is from 40% by mass to 70% by mass; ii) the ratio Al2O3/(SiO2+Al2O3) (mass ratio) is in the range of 0.15 to 0.40; iii) the content of Fe2O3 is from 16% by mass to 25% by mass; and iv) the content of CaO is from 5% by mass to 30% by mass, can be produced as an inorganic material having excellent melt spinnability and excellent radiation resistance.