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CLASSIFICATION // CHARACTERIZATION OF SOME ROCK ,unweathered intensely laminated widely fractured medium hard rock mudstone - Dark greyish green speckled white, slightly weathered very fine grained medium fractured very hard rock amygdaloidal andesite Where slaking of the core is observed or suspected, its nature and degree should be recorded after the description of the basic parameters...

Hard rock - WikipediaHard rock is a loosely defined subgenre of rock music that began in the mid-1960s, with the garage, psychedelic and blues rock movements It is typified by a heavy use of aggressive vocals, distorted electric guitars, bass guitar, drums, and often accompanied with keyboards...