硅镁石是层状硅酸盐类矿物的一种，它包括块硅镁石、粒硅镁石和斜硅镁石等。常含较多的铁和钛。属硅镁石族。晶体呈板状或粒状，集合体呈块状或粒状。白色或黄色至棕色。玻璃光泽。硬度6～6.5。密度：块硅镁石3.15g/cm3，斜硅镁石3.30g/cm3。常与金云母、尖晶石共生。
大吨位的熔制，过热现象是普遍存在的，但不会形成大量粒硅镁石。
In large scale melting pro-ess, superheating often occurs, but chondrodite forms only in a small quantity.
配方中K_2O含量，不仅影响着云母长大，而且还对熔体是否会析出硅镁石起着关键作用。
It is emphasized that the amount of K_2O inthe batch composition not only has an effect on the growth of mica crystals but also isa determining factor to the segregation of humite in the melt.
铁铝榴石呈红褐色，菱形十二面体晶形，化学成分以铁、铝、硅为主，含钙、镁等微量元素。
Almandine being red-brown rhombododecahedron consists of iron, aluminium and silicon, containing trace elements of calcium and magnesium.
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