Xenotime

Xenotime is named after Greek "kenos" - vain plus "time" - honor, because its contained yttrium had been mistakenly thought to be a new element.

Xenotime forms translucent to opaque yellowish brown, greenish brown, reddish brown, brown, gray prismatic crystals or radial aggregates.

Crystals of gem-quality are very rare.

Xenotime Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
Chemical Formula
YPO
 
4
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Photos of natural/un-cut material from mindat.org
Physical Properties of Xenotime
Mohs Hardness4 to 5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Specific Gravity4.30 to 5.10
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Optical Properties of Xenotime
Refractive Index1.720 to 1.827
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.095
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Colour
Colour (General)Yellowish-brown
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
TransparencyTranslucent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Crystallography of Xenotime
Crystal SystemTetragonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Further Information
Mineral information:Xenotime information at mindat.org
Significant Gem Localities
France
 
  • Nouvelle-Aquitaine
    • Dordogne
      • Thiviers
        • Saint-Jean-de-Côle
Pakistan
 
  • Khyber Pakhtunkhwa
    • Peshawar
      • Hameed Abad Kafoor Dheri
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