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Euxenite: Wikis


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Euxenite from Norway, around 11 cm of size
Category Oxide mineral
Chemical formula (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Color Black, brownish black,greenish black
Crystal habit Massive, anhedral crystals in matrix
Crystal system Orthorhombic
Twinning Common on [201]
Cleavage None
Fracture Conchoidal to subconchoidal
Mohs scale hardness 5.5 to 6.5
Luster Brilliant submetallic, waxy to resinous on fractures
Streak Yellowish, grayish, or reddish brown
Diaphaneity Opaque, translucent on thin edges
Specific gravity 4.7 to 5
Optical properties Isotropic
Refractive index n = 2.06 - 2.24
Other characteristics Metamict - originally crystalline, now amorphous due to radiation damage. Radioactive
References [1][2][3]

Euxenite or euxenite-(Y) (a correct mineralogical name) is a brownish black mineral with a metallic luster. It contains calcium, niobium, tantalum, cerium, titanium, yttrium, and typically uranium and thorium, with some other metals. The chemical formula is: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6. It occurs in granite pegmatites and detrital black sands.[1] It is commonly partially amorphous due to radiation damage.

It was first described in 1870 and named for From the Greek (εΰζευος), hospitable or friendly to strangers, in allusion to the many rare elements that it contains.[3][2]

It is found in many locations worldwide, notably its type locality in Jølster, Sunnfjord, Norway.[2] Other locations include include the Ural Mountains of Russia; Sweden; Minas Gerais, Brazil; Ampangabe, Madagascar; Ontario, Canada; and in Arizona, Wyoming and Colorado in the U. S. A.[4]

Euxenite is used as an ore of the rare earth elements it contains. Rare large crystals have also been used in jewelry.[4]


  1. ^ a b Minderal Handbook
  2. ^ a b c Webmineral data
  3. ^ a b Mindat

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