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 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:schists, sheared grits and granulitic gneisses; they often show, on 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:augite, garnet, scapolite, &c., but their source may usually be inferred from their close association with
See also:talc-silicate rocks in the
See also:field . The third
See also:group of epidosites may
See also:form bands,
See also:veins, or irregular streaks and nodules in masses of epidiorite and
See also:hornblende-schist . In microscopic section they are often merely a granular
See also:mosaic of quartz and epidote with some iron oxides and
See also:chlorite, but in other cases they retain much of the structure of the originar rock though there has been a
See also:complete replacement of the former minerals by new ones . Epidosites when streaked and variegated have been cut and polished as ornamental stones . They are translucent and hard, and hence serve for
See also:brooch stones, and the simpler kinds of
See also:jewelry . These rocks occasionally carry gold in visible yellow specks . (J .
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