rock type

基本解释

The magnetism of several kinds of chrysotile asbestos of ultrabasic rock type from Sichuan, Mangya and Xinkang Asbestos Mines were investigated.
研究了我國四川、新康與茫崖三個石棉鑛所産的超基性巖型纖蛇紋石石棉的磁性。
The mine is the earliest discovered broken belt altered rock type gold deposit, it belongs to remelting magma mesothermal type.
該鑛是發現最早的破碎帶蝕變巖型金鑛牀，其成因屬重熔巖漿中溫熱液型。
Accordingly, the emphasis must by placed on the prospecting of tough shear zone type and tectonic altered rock type gold deposits.
因此，在庫斯拉甫地區，應注重尋找靭性剪切帶型金鑛和搆造蝕變巖型金鑛。

That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.
ECONOMIST: Asteroid impacts