Some of the "porphyroids" which have grains of quartz and felspar in a finely schistose micaceous matrix are intermediate between porphyries and micaschists of this group. Still more numerous are orthoschists of hornblendic character (hornblende-schists) consisting of green hornblende with often felspar, quartz and sphene (also rutile, garnet, epidote or zoisite, biotite and iron oxides).
They are principally finely divided quartz, epidote, zoisite, rutile, limonite, calcite, pyrites,.
Nature's Jewelry: A wide range of jewelry, including silver rings with unique gems such as lapis, red onyx, and ruby zoisite.
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