Euxenite from Norway , around 11 cm of size
|Space group||Pcmn (no. 62)|
|Color||Black, brownish black,greenish black|
|Crystal habit||Massive, anhedral crystals in matrix|
|Twinning||Common on |
|Fracture||Conchoidal to subconchoidal|
|Mohs scale hardness||5.5 to 6.5|
||re|er}}||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|
|Refractive index||n = 2.06 - 2.24|
|Other characteristics||Metamict - originally crystalline, now amorphous due to radiation damage. Radioactive|
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, Ti2)O6. It is commonly partially amorphous due to radiation damage.
Euxenite forms a continuous series with the titanium rich polycrase-(Y) having the formula (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6.
Name and discovery
It is found in many locations worldwide, notably its type locality in Jølster, Sunnfjord, Norway . Other locations include the Ural Mountains of Russia ; Sweden; Minas Gerais, Brazil ; Ampangabe, Madagascar ; Ontario, Canada; and in Arizona, Wyoming and Colorado in the US.
- http://rruff.geo.arizona.edu/doclib/hom/euxenitey.pdf Minderal Handbook
- http://webmineral.com/data/Euxenite-(Y).shtml Webmineral data
- http://www.mindat.org/min-1425.html Mindat
- http://www.galleries.com/minerals/oxides/euxenite/euxenite.htm Mineral Galleries
Original source: https://en.wikipedia.org/wiki/ Euxenite. Read more