一种富含铝质矿物的化学沉积岩。又称铝矾土。Al2O3∶SiO2>1，主要矿物成分为：一水硬铝石、一水软铝石、三水铝矿。外貌与黏土岩相似。但致密、比重大，无可塑性。常具鲕状，豆状结构，以及块状构造。
实践证明，用磷铝质岩加工制成的新肥，不仅肥效显著，更有巨大的抗旱能力。
Practice shows that a new-type fertilizer which is made out of aluminiferous phosphate rocks is characteristic not only of considerable fertilizer effect but of higher anti-drought ability.
矿床产于中生代花岗闪长岩和古生代钙铝质岩石的接触带中，矿体受构造和岩性控制。
The orebody is located in a contacting belt between granodiorite of Mesozonic and calcareous-aluminous rocks of Peleozoic, and controled by structure and nature of the rocks.
镁铝榴石形成于滇东南晚第三纪岩简状的玄武质次火山角砾岩中，角砾岩成分复杂，其中包含有镁铝榴石和铬透辉石等可作宝石材料利用的角砾和晶屑。
The rubbles and crpetals of prrope and chrome-diopsidewhich can be used as gem materials are found in the breccias whose component is very complex.
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