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Definition: EUDIALYTE

Part of Speech Definition
Noun 1. A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Eudialyte" was first used in popular English literature: sometime before 1828. (references)

Etymology:Eudialyte \Eu*di"a*lyte\, noun. [Greek expression well easily to dissolve. So called because easily dissolvable in acids.]. (references)

Specialty Definition: EUDIALYTE

Domain Definition
Noah Webster [Noun] A mineral of a brownish red color.. Source: Webster's 1828 American Dictionary.
Mining A trigonal mineral, Na4 (Ca, Ce)2 (Fe, Mn, Y) ZrSi8 O 22 (OH, Cl)2 (?); weakly radioactive; in nepheline syenite and granite, commonly associated with arfvedsonite, sodalite, feldspar, aegirine, catapleiite, and astrophyllite. Cf: eucolite. Syn: barsanovite. (references)
Wikipedic Eudialyte, whose name derives from the Greek eu and dialytos, meaning "well decomposable" is a somewhat rare, red silicate mineral, which forms in alkaline igneous rocks, such as nepheline syenites. Its name alludes to its ready solubility in acid. (references)

Source: compiled by the editor from various references; see credits.

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Extended Definition: EUDIALYTE

Eudialyte

Eudialyte

General
Category Mineral
Chemical formula Na15Ca6(Fe,Mn)3Zr3SiO(O,OH,H2O)3(Si3O9)2(Si9O27)2(OH,Cl)2
Identification
Color Red, magenta, brown; also blue and yellow
Crystal habit Granular, tabular
Crystal system Trigonal
Cleavage [0001] Imperfect
Fracture Uneven
Mohs Scale hardness 5 - 5.5
Luster Vitreous
Refractive index 1.598 - 1.602
Pleochroism Weak, brown-red to red-pink to yellow
Streak White
Specific gravity 2.8 - 3
Solubility H2SO4
Diaphaneity Transparent to translucent
Other Characteristics Mildly Radioactive

Eudialyte, whose name derives from the Greek eu and dialytos, meaning "well decomposable", is a somewhat rare, red silicate mineral, which forms in alkaline igneous rocks, such as nepheline syenites. Its name alludes to its ready solubility in acid.

Uses of eudialyte

Eudialyte is used as a minor ore of zirconium. Another use of eudialyte is as a minor gemstone, but this use is limited by its rarity, which is compounded by its poor crystal habit. These factors make eudialyte of primary interest as a collector's mineral.

Associated minerals

Eudialyte is found associated with other alkalic igneous minerals, in addition to the some minerals common to most igneous material in general. These minerals include:

  • nepheline, (Na, K)AlSiO4
  • aegirine, NaFeSi2O6
  • natrolite, Na2Al2Si3O10 · 2H2O
  • albite, NaAlSi3O8

Alternative names

Alternative names of eudialyte include: almandine spar and eudalite. Eucolite is the name of an altered form.

Notes for identification

Eudialyte's rarity makes locality useful in its identification. Prominent localities of eudialyte include Mont Saint-Hilaire in Canada and the Kola Peninsula in Russia, but it is also found in Greenland, Norway, and Arkansas. The lack of crystal habit, associated with color, is also useful for identification, as are associated minerals. A pink-red mineral with no good crystals associated with other alkaline igneous material, especially nepheline and aegirine, is a good indication a specimen is eudialyte.

References

Manganese minerals
Borates
Sussexite · Tusionite
Carbonates
Ankerite · Kutnohorite · Rhodochrosite  · Manganoan Calcite
Oxides
Birnessite · Bixbyite · Ferrocolumbite · Ferrotantalite · Galaxite · Glaucochroite · Hausmannite · Hübnerite · Jacobsite · Manganite · Manganotantalite · Nsutite · Psilomelane · Pyrolusite · Romanèchite · Tantalite · Todorokite · Umber · Wolframite
Phosphates
Childrenite · Graftonite · Lithiophilite · Natrophilite · Purpurite · Triplite · Triploidite · Zanazziite
Silicates
Babingtonite · Bixbite · Braunite · Calderite · Chloritoid · Eudialyte · Jeffersonite · Knebelite · Ottrelite · Piemontite · Pyroxferroite · Rhodonite · Spessartine · Sugilite · Tephroite · Zakharovite · Zircophyllite
Sulfides
Alabandite · Hauerite · Rambergite
Other
Axinite (borosilicate) · Geigerite (arsenate) · Manganese nodule (various) · Zincobotryogen (sulfate)

Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Eudialyte". Image Credit.
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