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Zircon
Zircon crystal from Tocantins, Brazil (2×2 cm)
General
CategoryMineral
Formula
(repeating unit)
zirconium silicate ZrSiO4
Crystal systemTetragonal Ditetragonal Dipyramidal 4/m 2/m 2/m
Space groupTetragonal 4/m 2/m 2/m
Unit cella = 6.607(1) Å, c = 5.982(1) Å; Z=4
Identification
ColorReddish brown, yellow, green, blue, gray, colorless; in thin section, colorless to pale brown
Crystal habittabular to prismatic crystals, irregular grains, massive
TwinningOn {101}
Cleavageindistinct, on {110} and {111}
FractureConchoidal to uneven
TenacityBrittle
Mohs scale hardness7.5
LusterVitreous to adamantine; greasy when metamict.
StreakWhite
DiaphaneityTransparent to opaque
Specific 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
PleochroismWeak
FusibilityInfusible
SolubilityInsoluble
Other characteristicsFluorescent and radioactive, may form pleochroic halos
References[1][2][3][4]

Reinerite is a rare arsenite (arsenate(III)) mineral with formula Zn3(AsO3)2, known especially from the polymetallic Tsumeb deposit.[5][6]

References

[edit]
  1. ^ Handbook of Mineralogy
  2. ^ Mindat
  3. ^ Webmineral
  4. ^ Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., ISBN 0-471-80580-7
  5. ^ http://www.mindat.org/min-3386.html Mindat
  6. ^ http://rruff.geo.arizona.edu/doclib/hom/reinerite.pdf Handbook of Mineralogy

Notes

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