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.
不同岩性火山岩的物性也有较大的差别，并以熔渣状玄武岩、杏仁状安山岩、火山角砾岩为好；
This investigation also finds that different lithology have different physical properties and the slaggy basalt, the amygdaline basalt and the volcanic breccia have the best physical properties.
研究认为，在板块构造的敛合带上，斑岩铜矿发育地区，常见有角砾状地质体和角砾岩筒。
The research results show that the porphyry copper deposits are mostly associated with the breccia body and breccia pipe.
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