Mineral

Formula

Microwave heating

Hematite

Fe₂O₃

Heat readily, but no mineral phase change (active)

Quartz

SiO₂

Does not heat (inactive)

Fluroapatite

Ca₅(PO₄, CO₃)₃F

Very little or no heat generated

Chamosite

(Fe⁺⁺, Mg, Fe⁺⁺⁺)₅Al(Si₃Al)O₁₀(OH, O)₈

Very little or no heat generated