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Mineralpedia Details for Xenotime-(Y)

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Xenotime-(Y)

Xenotime-(Y)

The yttrium in Xenotime had been mistaken for a new element at the time of its discovery, hence it being named for the Greek for “vain” and “honor.” While exceptional crystals are uncommon, there are abundant localities at which Xenotime can be found occurring as an accessory mineral in rocks with alkali to granitic compositions and pegmatites associated with these rocks. It can also be found in Alpine veins, gneiss, and commonly in placer deposits. Xenotime is paramagnetic, meaning it is only magnetically attracted when there is an external magnetic field applied. Xenotime can exhibit a yellow cathodoluminescence. May be susceptible to or resistant to acids, depending on the composition.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/xenotime-(Y).pdf

Formula
YPO4 
Crystal System
Tetragonal 
Crystal Habit
Radial, Prismatic, Massive - Granular 
Cleavage
Perfect, None, None 
Luster
Vitreous - Greasy 
Color
yellowish brown, greenish brown, gray, reddish brown, brown 
Streak
white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Splintery 
Hardness
4-5 
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Xenotime-(Y) from Zegi Mountain, Khber Agency, FATA, Pakistan

Xenotime-(Y)
            from Zegi Mountain, Khber Agency, FATA, Pakistan

Dark yellow micro crystals of Xanthoconite to about 0.75mm.

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Xenotime-(Y) from Torghar, Khyber Agency, FATA, Pakistan

Xenotime-(Y)
            from Torghar, Khyber Agency, FATA, Pakistan

Superb terminated Xenotime with multiple modifications. Seems to be a little color changing under various lights. Overall 2x1x1cm.

Translucent brownish red tetragonal prism with first and second order pyrimidal terminations. There are two crystals in parallel.

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