Zircon

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Zircon
Zircão.jpeg
Zircon crystal frae Tocantins, Brazil (2×2 cm)
General
CategoryNesosilicates
Formula
(repeatin unit)
zirconium silicate (ZrSiO4)
Strunz clessification09.AD.30
Creestal seestemTetragonal
Space groupTetragonal ditetragonal dipyramidal
H-M seembol: (4/m 2/m 2/m)
Space group: I 41/amd
Unit cella = 6.607(1) Å, c = 5.982(1) Å; Z=4
Identification
ColourReddish broun, yellae, green, blae, gray, colourless; in thin section, colourless tae fauch broun
Creestal habittabular tae prismatic crystals, irregular grains, massive
TwinninOn {101}
Cleavageindistinct, on {110} an {111}
FracturConchoidal tae uneven
TenacityBrickle
Mohs scale haurdness7.5
SkinkleVitreous tae adamantine; glittie whan metamict.
StreakWhite
DiaphaneitySkyre tae opaque
Speceefic gravity4.6–4.7
Optical propertiesUniaxial (+)
Refractive indexnω = 1.925–1.961
nε = 1.980–2.015, 1.75 when metamict
Birefringenceδ = 0.047–0.055
PleochroismWaik
Fusibilityclose tae 2,550 °C depend on Hf,Th,U,H,etc... concentrations.
SolubilityInsoluble
Ither chairacteristicsFluorescent an radioactive, mey form pleochroic halos
References[1][2][3][4]

Zircon (/zɘrkon/~/zɪrkɔn/) (includin hyacinth or yellae zircon) is a mineral belangin tae the group o nesosilicates.

References[eedit | eedit soorce]

  1. Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W. and Nichols, Monte C. (ed.). "Zircon". Handbook of Mineralogy (PDF). II (Silica, Silicates). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209716.CS1 maint: multiple names: eeditors leet (link)
  2. Zircon. Mindat
  3. Zircon. Webmineral
  4. Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., ISBN 0-471-80580-7