What metal is found in slate stone?

Question

What metal is found in slate stone?

Answer 1

Slate is mainly composed of quartz and muscovite or illite, often along with biotite, chlorite, hematite, and pyrite along with, less frequently, apatite, graphite, kaolin, magnetite, tourmaline, or zircon as well as feldspar.

Occasionally, as in the purple slates of North Wales, ferrous reduction spheres form around iron nuclei, leaving a light green spotted texture.

Answer 2

Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism

Slate is mainly composed of quartz and muscovite or illite, often along with biotite, chlorite, hematite, and pyrite along with, less frequently, apatite, graphite, kaolin, magnetite, tourmaline, or zircon as well as feldspar. Occasionally, as in the purple slates of North Wales, ferrous reduction spheres form around iron nuclei, leaving a light green spotted texture. These spheres are sometimes deformed by a subsequent applied stress field to ovoids, which appear as ellipses when viewed on a cleavage plane of the specimen.

Slate is also found in the Arctic and was used by the Inuit to make the blades for ulus. China has vast slate deposits; in recent years its export of finished and unfinished slate has increased.

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http://en.wikipedia.org/wiki/Slate#Exter...

Muscovite is the most common mica mineral. It's also called white mica. The best way to tell a mica is by the thin, transparent sheets that it cleaves into. Large, clear plates of mica were once commonly used for windows, and the productive Russian mica mines gave muscovite its name. Today mica windows are still used in cast-iron stoves, but the greater use of muscovite is as insulators in electrical equipment.

Slate is considered the lowest grade of metamorphic rock. It forms when shale, which consists of clay minerals like the sediments from which it formed, is put under pressure with temperatures of a few hundred degrees or so. Then the clays begin to revert to mica minerals.

This muscovite specimen is a chunk of mica schist from New England, shown at life size. There is some quartz and feldspar in it, but the mica flakes hide them pretty well. In any low-grade metamorphic rock, a shiny or glittery appearance is usually due to a mica mineral, either muscovite or the black mica biotite. The dark-green mica fuchsite and lilac-colored lepidolite may also be found.

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http://geology.about.com/library/bl/imag...