|
20
Ⅱ
很堅(jiān)固的巖石
很堅(jiān)固的花崗質(zhì)巖石、石英斑巖、很堅(jiān)硬的花崗巖、硅質(zhì)片巖、比上一級(jí)較不堅(jiān)硬的石英巖、最堅(jiān)硬的砂巖和石灰?guī)r
15
Ⅲ
堅(jiān)固的巖石
花崗巖（致密的）和花崗質(zhì)巖石，很堅(jiān)固的砂巖和石灰?guī)r，石英質(zhì)脈礦，堅(jiān)固的礫巖，極堅(jiān)硬的鐵礦
10
Ⅲa
堅(jiān)固的巖石
石灰?guī)r（堅(jiān)固的），不堅(jiān)固的花崗巖，堅(jiān)固的砂巖，堅(jiān)固的大理巖和白云巖，黃鐵礦
8
Ⅳ
頗堅(jiān)固的巖石
一般的砂礦，鐵礦
6
Ⅳa
頗堅(jiān)固的巖石
砂質(zhì)頁巖，頁巖質(zhì)砂巖
5
Ⅴ
中等的巖石
堅(jiān)固的黏土質(zhì)巖石，不堅(jiān)固的砂巖和石灰?guī)r
4
Ⅴa
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