tyuyamunite

{{Short description|Uranium mineral}}

{{Infobox mineral

| name = Tyuyamunite

| image = Tyuyamunite-286294.jpg

| imagesize = 260px

| alt =

| caption =

| category = Vanadate mineral

| formula = Ca(UO₂)₂V₂O₈·(5–8)H₂O

| IMAsymbol = Tyu{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| molweight =

| strunz = 4.HB.25

| dana = 40.2a.26.1

| system = Orthorhombic

| class = Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)

| symmetry = Pnna

| unit cell = a = 10.63 Å, b = 28.36 Å
c = 20.4 Å; Z = 4

| color =

| colour = Canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight)

| habit = Platy crystals often in radiating sprays, coatings, massive

| twinning =

| cleavage = Perfect on {001}, micaceous; distinct on {100} & {010}

| fracture =

| tenacity =

| mohs = {{frac|1|1|2}} – 2

| lustre = Adamantine, waxy, pearly on {101}, dull

| streak = Yellow

| diaphaneity = Translucent to opaque

| gravity = 3.57 – 4.35

| density =

| polish =

| opticalprop = Biaxial (−)

| refractive = n_α = 1.675 n_β = 1.860 – 1.870 n_γ = 1.885 – 1.895

| birefringence = 0.210 – 0.220

| pleochroism = weak: X = nearly colourless, Y = pale canary yellow, Z = canary yellow

| 2V = 30° to 45°

| dispersion = none

| extinction =

| length fast/slow =

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| fusibility =

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| alteration =

| other = 25px Radioactive

| prop1 =

| prop1text =

| references = [http://rruff.info/doclib/hom/tyuyamunite.pdf Handbook of Mineralogy][http://www.mindat.org/min-4072.html Tyuyamunite] at [http://www.mindat.org/ Mindat][http://webmineral.com/data/Tyuyamunite.shtml#.UiTkzNI3uSo Tyuyamunite data] on [http://webmineral.com/ Webmineral][http://www.galleries.com/Tyuyamunite Tyuyamunite] at [http://www.galleries.com/ Amethyst Galleries' Mineral Gallery]

}}

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.Lynch, Dan R. and Bob Lynch, "Tyuyamunite," Ed. Brett Ortler, Michigan Rocks & Minerals, Adventure Publications, 2010 {{ISBN|978-1591932390}} It was named by Konstantin Avtonomovich Nenadkevich, in 1912, after its type locality, Tyuya-Muyun, Fergana Valley, Kyrgyzstan.