variscite

/var"euh suyt'/, n.
a secondary mineral, hydrated phosphate of aluminum, Al(PO4)·2H2O, occurring mainly as massive, bluish-green nodules: sometimes used as a gem.
[ < G Variscit, named after Variscia Latinized German district name; see -ITE1]

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 phosphate mineral, hydrated aluminum phosphate (AlPO4·2H2O), which is valued as a semiprecious gemstone and an ornamental material. Both variscite and strengite, a similar mineral in which iron replaces aluminum in the crystal structure, occur as glassy nodules, veins, or crusts, in near-surface deposits: variscite is produced by the action of phosphate-rich waters on aluminous rocks, and strengite by alteration of iron-containing phosphates. Variscite is usually green; strengite, red. Variscite occurs in Germany, Austria, Czech Republic, Congo (Kinshasa), and Australia and in commercially important quantities near Fairfield, Utah, U.S. It also occurs with apatite on islands where phosphatic solutions from guano (seafowl excrement) have altered aluminous igneous rocks. Strengite deposits are known in Germany, Portugal, Sweden, and the United States. For detailed physical properties, see phosphate mineral (table).

      Variscite is cut en cabochon (cabochon cut) (with a round, convex, polished surface) for brooches, earrings, and beads and is frequently substituted for turquoise. It also is carved into bowls or other decorative objects. Because of its porosity, it tends to absorb grease and oil, which discolour it.

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Universalium. 2010.

Look at other dictionaries:

  • Variscite — Catégorie VIII : phosphates, arséniates, vanadates[1] Variscite La Floquerie, Pannecé, France …   Wikipédia en Français

  • Variscite — Var is*cite, n. [So called from Variscia in Germany.] (Min.) An apple green mineral occurring in reniform masses. It is a hydrous phosphate of alumina. [1913 Webster] …   The Collaborative International Dictionary of English

  • variscite — ● variscite nom féminin (de Variscia, ancien nom d une région, en Allemagne) Phosphate hydraté naturel d aluminium, orthorhombique …   Encyclopédie Universelle

  • Variscite — Infobox mineral name = Variscite category = mineral boxwidth = boxbgcolor = imagesize = caption = formula = AlPO4·2H2O molweight = color = Green, blue green, yellow green and rarely red habit = Encrustations and reniform masses system =… …   Wikipedia

  • variscite — noun A relatively rare hydrated aluminum phosphate mineral (AlPO·2HO), sometimes confused with turquoise …   Wiktionary

  • variscite —    A cave mineral AlPO4●2H2O [11] …   Lexicon of Cave and Karst Terminology

  • variscite — var·is·cite …   English syllables

  • variscite — ˈvarəˌsīt noun ( s) Etymology: German variscit, from Medieval Latin Variscia, ancient name of the Vogtland district, Saxony, Germany + German it ite : a bluish to greenish gem mineral sometimes confused with or substituted for turquoise called… …   Useful english dictionary

  • variscite green — noun : a light green that is yellower and less strong than average mint green and yellower and paler than serpentine …   Useful english dictionary

  • Variscit — aus der „Little Green Monster Variscite Mine“ bei Fairfield im Utah County, USA (Größe: 10,8 x 6,8 x 0,6 cm) Chemische Formel Al[PO4] • 2H2O …   Deutsch Wikipedia

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