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Zircon crystal from Tocantins, Brazil (2×2 cm)
Category Mineral
(repeating unit)
zirconium silicate ZrSiO4
Crystal system Tetragonal Ditetragonal Dipyramidal 4/m 2/m 2/m
Space group Tetragonal 4/m 2/m 2/m
Unit cell a = 6.607(1) Å, c = 5.982(1) Å; Z=4
Color Reddish brown, yellow, green, blue, gray, colorless; in thin section, colorless to pale brown
Crystal habit tabular to prismatic crystals, irregular grains, massive
Twinning On {101}
Cleavage indistinct, on {110} and {111}
Fracture Conchoidal to uneven
Tenacity Brittle
Mohs scale hardness 7.5
Luster Vitreous to adamantine; greasy when metamict.
Streak White
Diaphaneity Transparent to opaque
Specific gravity 4.6–4.7
Optical properties Uniaxial (+)
Refractive index nω = 1.925-1.961 nε = 1.980-2.015, 1.75 when metamict
Birefringence δ = 0.047–0.055
Pleochroism Weak
Fusibility Infusible
Solubility Insoluble
Other characteristics Fluorescent 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]


  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. ^ Mindat
  6. ^ Handbook of Mineralogy