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{{Short description|Uranium mineral}}
{{Infobox mineral
{{Infobox mineral
| name = Tyuyamunite
| name = Tyuyamunite
| image = Tyuyamunite-286294.jpg
| image = Tyuyamunite-286294.jpg
| imagesize = 260px
| alt =
| alt =
| caption = Tyuyamunite
| caption =
| category = Vanadate mineral
| category = Vanadate mineral
| formula = Ca(UO<sub>2</sub>)<sub>2</sub>V<sub>2</sub>O<sub>8</sub>·(5-8)H<sub>2</sub>O
| formula = Ca(UO<sub>2</sub>)<sub>2</sub>V<sub>2</sub>O<sub>8</sub>·(5–8)H<sub>2</sub>O
| IMAsymbol = Tyu<ref>{{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}}</ref>
⚫
| molweight =
| strunz = 4.HB.25
| strunz = 4.HB.25
| dana = 40.2a.26.1
| dana = 40.2a.26.1
⚫
| system = [[Orthorhombic]]
| symmetry = Orthorhombic - dipyramidal <br/>[[H-M symbol]] (2/m 2/m 2/m) <br/>[[Space group]]: Pnan
| class = Dipyramidal (mmm) <br/>[[H-M symbol]]: (2/m 2/m 2/m)
| symmetry = ''Pnna''
| unit cell = a = 10.63&nbsp;[[Ångström|Å]], b = 28.36&nbsp;Å <br/>c = 20.4&nbsp;Å; Z&nbsp;=&nbsp;4
| unit cell = a = 10.63&nbsp;[[Ångström|Å]], b = 28.36&nbsp;Å <br/>c = 20.4&nbsp;Å; Z&nbsp;=&nbsp;4
⚫
| molweight =
| color =
| color =
| colour = Canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight)
| colour = Canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight)
| habit = Platy crystals often in radiating sprays, coatings, massive
| habit = Platy crystals often in radiating sprays, coatings, massive
⚫
| system = [[Orthorhombic]]
| twinning =
| twinning =
| cleavage = Perfect on {001}, micaceous; distinct on {100} & {010}
| cleavage = Perfect on {001}, micaceous; distinct on {100} & {010}
| fracture =
| fracture =
| tenacity =
| tenacity =
| mohs = 1½ - 2
| mohs = {{frac|1|1|2}} – 2
| lustre = Adamantine, waxy, pearly on {101}, dull
| lustre = Adamantine, waxy, pearly on {101}, dull
| streak = Yellow
| streak = Yellow
| diaphaneity = Translucent to opaque
| diaphaneity = Translucent to opaque
| gravity = 3.57 - 4.35
| gravity = 3.57 – 4.35
| density =
| density =
| polish =
| polish =
| opticalprop = Biaxial (-)
| opticalprop = Biaxial (−)
| refractive = n<sub>α</sub> = 1.675 n<sub>β</sub> = 1.860 - 1.870 n<sub>γ</sub> = 1.885 - 1.895
| refractive = n<sub>α</sub> = 1.675 n<sub>β</sub> = 1.860 – 1.870 n<sub>γ</sub> = 1.885 – 1.895
| birefringence = 0.210 - 0.220
| birefringence = 0.210 – 0.220
| pleochroism = weak: X = nearly colourless, Y = pale canary yellow, Z = canary yellow
| pleochroism = weak: X = nearly colourless, Y = pale canary yellow, Z = canary yellow
| 2V = 30° to 45°
| 2V = 30° to 45°
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| references = <ref name=HBM>[http://rruff.info/doclib/hom/tyuyamunite.pdf Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-4072.html Tyuyamunite] at [http://www.mindat.org/ Mindat]</ref><ref name=Webmin>[http://webmineral.com/data/Tyuyamunite.shtml#.UiTkzNI3uSo Tyuyamunite data] on [http://webmineral.com/ Webmineral]</ref><ref>[http://www.galleries.com/Tyuyamunite Tyuyamunite] at [http://www.galleries.com/ Amethyst Galleries' Mineral Gallery]</ref>
| references = <ref name=HBM>[http://rruff.info/doclib/hom/tyuyamunite.pdf Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-4072.html Tyuyamunite] at [http://www.mindat.org/ Mindat]</ref><ref name=Webmin>[http://webmineral.com/data/Tyuyamunite.shtml#.UiTkzNI3uSo Tyuyamunite data] on [http://webmineral.com/ Webmineral]</ref><ref>[http://www.galleries.com/Tyuyamunite Tyuyamunite] at [http://www.galleries.com/ Amethyst Galleries' Mineral Gallery]</ref>
}}
}}
'''Tyuyamunite''' (pronounced tuh-YOO-ya-moon-ite) is a very rare [[uranium]] [[mineral]] with formula Ca(UO<sub>2</sub>)<sub>2</sub>V<sub>2</sub>O<sub>8</sub>·(5-8)H<sub>2</sub>O. 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]].<ref name=Lynch>Lynch, Dan R. and Bob Lynch, "Tyuyamunite," Ed. Brett Ortler, ''Michigan Rocks & Minerals,'' Adventure Publications, 2010 ISBN 978-1591932390</ref> It was named by Konstantin Avtonomovich Nenadkevich, in 1912, after its discovery locality, Tyuya-Muyun, [[Fergana Valley]], [[Kyrgyzstan]].<ref name=Mindat/>
'''Tyuyamunite''' (pronounced tuh-YOO-ya-moon-ite) is a very rare [[uranium]] [[mineral]] with formula Ca(UO<sub>2</sub>)<sub>2</sub>V<sub>2</sub>O<sub>8</sub>·(5–8)H<sub>2</sub>O. 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]].<ref name=Lynch>Lynch, Dan R. and Bob Lynch, "Tyuyamunite," Ed. Brett Ortler, ''Michigan Rocks & Minerals,'' Adventure Publications, 2010 {{ISBN|978-1591932390}}</ref> It was named by Konstantin Avtonomovich Nenadkevich, in 1912, after its [[type locality (geology)|type locality]], Tyuya-Muyun, [[Fergana Valley]], [[Kyrgyzstan]].<ref name=Mindat/>


==Formation and transformation==
==Formation and transformation==
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]]<ref name=Lynch/> Ca(UO<sub>2</sub>)<sub>2</sub>(VO<sub>4</sub>)<sub>2</sub>·3-5H<sub>2</sub>O<ref>[http://www.mindat.org/min-2690.html Metatyuyamunite] on [http://www.mindat.org Mindat]</ref>
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]]<ref name=Lynch/> Ca(UO<sub>2</sub>)<sub>2</sub>(VO<sub>4</sub>)<sub>2</sub>·3-5H<sub>2</sub>O.<ref>[http://www.mindat.org/min-2690.html Metatyuyamunite] on [http://www.mindat.org Mindat]</ref>


==References==
==References==
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*[http://www.mindat.org/min-4072.html Tyuyamunite] at [http://www.mindat.org/ Mindat]
*[http://www.mindat.org/min-4072.html Tyuyamunite] at [http://www.mindat.org/ Mindat]


[[Category:Uranium minerals]]
[[Category:Uranium(VI) minerals]]
[[Category:Vanadate minerals]]
[[Category:Vanadate minerals]]
[[Category:Orthorhombic minerals]]
[[Category:Orthorhombic minerals]]
[[Category:Minerals in space group 52]]
[[Category:Luminescent minerals]]
[[Category:Luminescent minerals]]
[[Category:Minerals described in 1912]]


{{mineral-stub}}
{{mineral-stub}}

Latest revision as of 20:11, 17 January 2024

Tyuyamunite
General
CategoryVanadate mineral
Formula
(repeating unit)		Ca(UO2)2V2O8·(5–8)H2O
IMA symbolTyu[1]
Strunz classification4.HB.25
Dana classification40.2a.26.1
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPnna
Unit cella = 10.63 Å, b = 28.36 Å
c = 20.4 Å; Z = 4
Identification
ColourCanary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight)
Crystal habitPlaty crystals often in radiating sprays, coatings, massive
CleavagePerfect on {001}, micaceous; distinct on {100} & {010}
Mohs scale hardness1+1⁄2 – 2
LustreAdamantine, waxy, pearly on {101}, dull
StreakYellow
DiaphaneityTranslucent to opaque
Specific gravity3.57 – 4.35
Optical propertiesBiaxial (−)
Refractive indexnα = 1.675 nβ = 1.860 – 1.870 nγ = 1.885 – 1.895
Birefringence0.210 – 0.220
Pleochroismweak: X = nearly colourless, Y = pale canary yellow, Z = canary yellow
2V angle30° to 45°
Dispersionnone
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]

References

[edit]
  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Handbook of Mineralogy
  3. ^ a b Tyuyamunite at Mindat
  4. ^ Tyuyamunite data on Webmineral
  5. ^ Tyuyamunite at Amethyst Galleries' Mineral Gallery
  6. ^ a b Lynch, Dan R. and Bob Lynch, "Tyuyamunite," Ed. Brett Ortler, Michigan Rocks & Minerals, Adventure Publications, 2010 ISBN 978-1591932390
  7. ^ Metatyuyamunite on Mindat
[edit]
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