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Natural History Center Svilajnac 16.JPG
Jadarite on display at the Natural History Center in Svilajnac, Serbia
Category Nesosilicate
(repeating unit)
Strunz classification 9.AJ.40
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/n
Unit cell a = 6.816(2), b = 13.789(2)
c = 6.758(2) [Å]; β = 111.08(2)°; Z = 4
Formula mass 219.46 g/mol
Color White
Crystal habit As microscopic anhedral grains
Fracture Irregular to conchoidal
Tenacity Brittle
Mohs scale hardness 4 - 5
Luster Dull
Streak White
Diaphaneity Translucent to opaque
Specific gravity 2.45
Optical properties Biaxial
Ultraviolet fluorescence Weak pink to orange under UV
References [1][2]

Jadarite is a white, earthy monoclinic silicate mineral,[1] whose chemical formula is: LiNaSiB3O7(OH) or Na2OLi2O(SiO2)2(B2O3)3H2O.

It was discovered in November 2006, in drill core from the Jadar Valley (Serbian Cyrillic: Јадар, Jadar) in Serbia, from which it is named. It was confirmed as a new mineral after scientists at the Natural History Museum in London and the National Research Council of Canada conducted tests on it.[3] Exploration geologists from Rio Tinto Exploration discovered the mineral as small rounded nodules in drill core, and after being unable to match it with previously known minerals enlisted the expertise of Chris Stanley, from the Natural History Museum, who later described it as being unique to mineralogy.[4]

Jadarite in fiction[edit]

Jadarite's chemical formula is very close to the formula ("sodium lithium boron silicate hydroxide with fluorine") invented for the fictional substance kryptonite in the 2006 film Superman Returns. This coincidence attracted mass-media attention, and jadarite was covered by ABC, BBC, CNN, Washington Post, and Yahoo, among others.

The new mineral, unlike the fictional material in the movie, does not contain fluorine, does not emit electromagnetic radiation, and is white rather than green (although, in the Superman comics, there is a white colored variety of kryptonite). In all other respects the chemistry matches that of the rock containing kryptonite in the movie. The jadarite fluoresces a pinkish-orange color when exposed to UV light.[5]


  1. ^ a b "Jadarite". mindat.org. 2007. Retrieved 2007-04-25. 
  2. ^ Webmineral data
  3. ^ Whitfield, Pamela. LiNaSiB3O7(OH) a novel structure of the new borosilicate mineral jadarite determined from laboratory powder diffraction data Acta Crystallographica Section B Structural Science, International Union of Crystallography, DOI 10.1107/S0108768107010130, ISSN 0567-7408. (abstract).
  4. ^ 'Kryptonite' discovered in mine. BBC News
  5. ^ "Kryptonit är är inte bara påhitt" (in Swedish). Retrieved 2007-04-24.