红帘石是一种含Mn~(3+)的岛状构造硅酸盐矿物,与绿帘石和斜黝帘石呈类质同象,空间群为P2_1/m,结构式为Ca_2(Al,Fe,Mn)O_6·AlO_4(OH)_2·AlO_6·SiO_4·Si_2O_7。它与后二者的区别主要是Mn~(3+)进入结构中,取代部分Fe~(3+)和Al,并使其呈现明显的多色性,红帘石的多色性公式为:α=黄,β=紫,γ=红。 Cordierite is an island-like silicate mineral containing Mn ~ (3 +), which is isomorphic with ettringite and diabase zonation, with a space group of P2_1 / m and a structural formula of Ca_2 (Al, Fe , Mn) O_6 · AlO_4 (OH) _2 · AlO_6 · SiO_4 · Si_2O_7. The difference between the latter and the latter is that Mn ~ (3 +) enters the structure, substituting some Fe ~ (3+) and Al, and rendering it obviously polychromatic. The polychromatic formula of the mitochondria is: α = yellow, β = purple, γ = red.