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EPIDOSITE , in See also: petrology, a typical member of a See also:family of metamorphic rocks composed mainly of See also:epidote and See also:quartz. In See also:colour they are See also:pale yellow or greenish yellow, and they are hard and somewhat brittle. They may occur in more than one way and are derived from several kinds of See also:rock. Some have been epidotic grits and sandstones; others are limestones which have undergone contact-alteration; probably the See also:majority, however, are allied to See also:epidiorite and See also:amphibolite, and are See also:local modifications of rocks which were primarily basic intrusions or lavas. The sedimentary epidosites occur with See also:mica-See also:schists, sheared grits and granulitic gneisses; they often show, on See also:minute examination, the remains of clastic structures. The epidosites derived from limestones may contain a See also:great variety of minerals such as See also:calcite, See also:augite, See also:garnet, See also:scapolite, &c., but their source may usually be inferred from their See also:close association with See also:talc-silicate rocks in the See also:
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