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Tyuyamunite - Wikipedia

From Wikipedia, the free encyclopedia

Uranium mineral

Tyuyamunite Category Vanadate mineral Formula Ca(UO2)2V2O8·(5–8)H2O IMA symbol Tyu[1] Strunz classification 4.HB.25 Dana classification 40.2a.26.1 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pnna Unit cell a = 10.63 Å, b = 28.36 Å
c = 20.4 Å; Z = 4 Colour Canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight) Crystal habit Platy crystals often in radiating sprays, coatings, massive Cleavage Perfect on {001}, micaceous; distinct on {100} & {010} Mohs scale hardness 1+1⁄2 – 2 Lustre Adamantine, waxy, pearly on {101}, dull Streak Yellow Diaphaneity Translucent to opaque Specific gravity 3.57 – 4.35 Optical properties Biaxial (−) Refractive index nα = 1.675 nβ = 1.860 – 1.870 nγ = 1.885 – 1.895 Birefringence 0.210 – 0.220 Pleochroism weak: X = nearly colourless, Y = pale canary yellow, Z = canary yellow 2V angle 30° to 45° Dispersion none Other characteristics Radioactive References [2][3][4][5]

Tyuyamunite (pronounced tuh-YOO-ya-moon-ite) is a very rare uranium mineral with formula Ca(UO2)2V2O8·(5–8)H2O. It is a member of the carnotite group. It is a bright, canary-yellow color because of its high uranium content. Also, because of tyuyamunite's high uranium content, it is radioactive.[6] It was named by Konstantin Avtonomovich Nenadkevich, in 1912, after its type locality, Tyuya-Muyun, Fergana Valley, Kyrgyzstan.[3]

Formation and transformation[edit]

Tyuyamunite is formed by the weathering of uraninite, a uranium-bearing mineral. Tyuyamunite, being a hydrous mineral, contains water. Yet when it is exposed to the atmosphere it loses its water. This process changes tyuyamunite into a different mineral known as metatyuyamunite[6] Ca(UO2)2(VO4)2·3-5H2O.[7]

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