Euxenite Value, Price, and Jewelry Information


Euxenite
By Aangelo (Own work) [GFDL or CC-BY-SA-3.0-2.5-2.0-1.0], via Wikimedia Commons

Euxenite is seldom seen in collections. Most collectors would not regard the mineral as facetable, but transparent fragments and areas of crystals have been noted that could cut small gems. Sometimes cabochons are cut by collectors, but these are not very striking. The colors of faceted stones would be too dark to make them appealing.

Euxenite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Euxenite Information

DataValue
NameEuxenite
Crystallography Orthorhombic. Crystals prismatic, stubby; as aggregates; massive.
Colors Black, sometimes with a tinge of brown or green.
Luster Submetallic; vitreous to resinous.
Fracture Conchoidal; brittle.
Hardness 5.5-6.5
Specific Gravity 4.30-5.87 depending on the Ta content and hydration.
Cleavage None.
Stone SizesGems cut from euxenite are almost always small, as the material is seldom transparent.
Luminescence None
Formula(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 Polycrase: (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6.

Series to Polycrase.

Streak: Grayish, yellow-brown.

Optics: Isotropic due to metamictization. N=2.06-2.24.

Luminescence: .

Occurrence: In granite pegmatites; also as detrital grains.

California; Colorado; Pennsylvania; Maine.

Norway; Canada; Greenland; Brazil; Finland; Zaire; Madagascar; Australia.

Wyoming: large crystals.

Comments: Euxenite is seldom seen in collections. Most collectors would not regard the mineral as facetable, but transparent fragments and areas of crystals have been noted that could cut small gems. Sometimes cabochons are cut by collectors, but these are not very striking. The colors of faceted stones would be too dark to make them appealing.

Name: From the Greek euxenos (hospitable) because of the many useful elements it contains. Polycrase is from the Greek, meaning mixture of many, also in allusion to the composition.