phacolith


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phacolith

(ˈfeɪkəˌlɪθ)
n
(Geological Science) geology a layer of igneous rock, which has the structure of a lens, and which occurs in an invasive position in sedimentary rock
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References in periodicals archive ?
And the formation of phacolith between the groove and drilling hole prevented the water jet from entering into the bottom; thus, it needs to break the phacolith and then the water could arrive at the bottom to carry debris, causing the drilling speed to be decreased and bit wear to be increased.