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Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers
From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone
Fine Grained Rock, Opaque Rock
Enderbite rock is an igneous rock which belongs to the Charnockite rock series
From its occurrence in Enderby Land, Antarctica
Coarse Grained Rock, Opaque Rock