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Encyclopedia Britannica - Main :: EMS-EUD |
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EPIDIORITE , in petrology, a typical member of a family of rocks consisting essentially of hornblende and felspar, often with epidote
quartz
term
amphibolite
mineral
epidote
zoisite
quartz
original
rock
hornblende. Pink
diameter . The iron oxides, originally ilmenite, are usually altered to sphene. Biotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency. The essential minerals, hornblende and felspar, rarely show crystalline outlines, and this is generally true also of the others. The rocks may be fine grained, so that their constituents are hardly visible to the unaided eye; or may show crystals of hornblende an inch in length. Their prevalent colour is dark green and they weather with brown surfaces. In many parts of the world epidiorites and the quartz veins which sometimes occur in them have proved to be auriferous. As they are tough, hard rocks, when fresh, they are well suited for use as road-mending stones. (J. S. F.)End of Article: EPIDIORITE If you wish, you can link directly to this article.
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