amazon stone n.

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also called  Amazonite,  

      a gemstone variety of green microcline (q.v.), a feldspar mineral. Frequently confused with jade, amazonstone varies in colour from yellow-green to blue-green and may also exhibit fine white streaks; it is usually opaque and therefore is cut en cabochon (cabochon cut) (with a rounded and convex polished surface). Although its name is derived from the Amazon River, no deposits have been found there. Amazonstone has been mined in Minas Gerais, Brazil; Ontario and Quebec, Canada; Baveno, Italy; and the Ural Mountains of Russia. The Pikes Peak district of Colorado, U.S., became the most important source of amazonstone after 1876; when samples were unveiled at the Centennial Exhibition, their impressive purity and size eventually forced competing Russian mineral dealers out of business.

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Universalium. 2010.

Look at other dictionaries:

  • amazonstone — noun Date: 1836 amazonite …   New Collegiate Dictionary

  • amazonstone — noun A bluish green variety of microcline feldspar used as a gemstone. The best known occurrences are at Crystal Peak and Pikes Peak in Colorado …   Wiktionary

  • amazonstone — am·a·zon·stone …   English syllables

  • amazonstone — noun see amazonite …   Useful english dictionary

  • microcline — /muy kreuh kluyn /, n. a mineral of the feldspar group, potassium aluminum silicate, KAlSi3O8, identical in composition with orthoclase but having triclinic instead of monoclinic crystals, used in making porcelain. [1840 50; MICRO + cline < Gk… …   Universalium

  • feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… …   Universalium

  • microcline — noun A common feldspar of igneous, plutonic, and metamorphic rocks, made of potassium aluminum silicate, with the chemical formula KAlSiO. Microcline is the main feldspar of granite. The bluish green variety is called amazonstone, and is… …   Wiktionary

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