Sedimentary rocks—the most common rock type near the surface—are also the most common reservoirs for water because they contain the most space that can be filled with water.

沉积岩——地表附近最常见的岩石类型——也是最常见的储水层，因为它们可以装水的空间最多。

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Gem is the most beautiful and expensive rock type.

宝石是岩石中最美丽而贵重的一类。

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The deposit belongs to low sulphide altered rock type.

矿化类型主要是少硫化物的蚀变岩型。

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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

Yellowknife was chosen as a destination because it represents a different type of rock terrain from the one on which Curiosity landed in August and on which it has done most of its driving.

BBC: Mars rover finally looks set to drill

The label featured a rather ugly brown rock. (Silex is the type of soil found in the Dagueneau vineyards.) "It is kind of ugly, " I admitted.

WSJ: Bryan Ferry, Drinking Wine With Lettie Teague