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| alt =
| alt =
| caption = Tyuyamunite
| caption = Tyuyamunite
| 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
| strunz = 4.HB.25
| strunz = 4.HB.25
| dana = 40.2a.26.1
| dana = 40.2a.26.1
| symmetry = Orthorhombic dipyramidal<br>[[H-M symbol]]: (2/m 2/m 2/m) <br>[[Space group]]: Pnan
| symmetry =
| unit cell = a = 10.63Å, b = 28.36Å, c = 20.4Å
| unit cell = a = 10.63 Å, b = 28.36 Å, c = 20.4 Å
| molweight =
| 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 =
| habit = Platy crystals often in radiating sprays, coatings, massive
| system = Orthorhombic
| system = [[Orthorhombic]]
| twinning =
| twinning =
| cleavage = Perfect on {001}, micaceous; distinct on {100} & {010}
| cleavage = Perfect on {001}, micaceous; distinct on {100} & {010}
| fracture = micaceous
| fracture =
| tenacity =
| tenacity =
| mohs = 1½ - 2
| mohs = 1½ - 2
| luster = adamantine, waxy, pearly, dull
| luster = Adamantine, waxy, pearly on {101}, dull
| streak = yellow
| streak = Yellow
| diaphaneity = translucent, opaque
| diaphaneity = Translucent to opaque
| gravity = 3.4 - 4
| gravity = 3.57 - 4.35
| density = 3.57 - 4.35 g/cm<sup>3</sup>
| density =
| polish =
| polish =
| opticalprop =
| 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 =
| birefringence = 0.210 - 0.220
| birefringence = 0.210 - 0.220
| pleochroism = weak
| pleochroism = weak: X = nearly colourless, Y = pale canary yellow, Z = canary yellow
| 2V = 30° to 45°
| 2V = 30° to 45°
| dispersion = none
| dispersion = none
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| prop1 =
| prop1 =
| prop1text =
| prop1text =
| 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 on Mindat.org]</ref><ref name=Webmin>[http://en.wikipedia.org/enwiki/w/index.php?title=Tyuyamunite&action=edit Tyuyamunite data on Webmineral]</ref><ref>[http://www.galleries.com/Tyuyamunite Mineral Galleries]</ref>
| references = <ref>http://www.galleries.com/Tyuyamunite</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>[http://www.mindat.org/min-4072.html Tyuyamunite on Mindat.org]</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/>


== Formation and transformation ==
== Formation and transformation ==

Revision as of 22:35, 11 June 2013

Tyuyamunite
Tyuyamunite
General
CategoryVanadate mineral
Formula
(repeating unit)		Ca(UO2)2V2O8·(5-8)H2O
Strunz classification4.HB.25
Dana classification40.2a.26.1
Crystal systemOrthorhombic
Space groupOrthorhombic dipyramidal
H-M symbol: (2/m 2/m 2/m)
Space group: Pnan
Unit cella = 10.63 Å, b = 28.36 Å, c = 20.4 Å
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 hardness1½ - 2
LusterAdamantine, 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
References[1][2][3][4]

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.[5] It was named by Konstantin Avtonomovich Nenadkevich, in 1912, after its discovery locality, Tyuya-Muyun, Fergana Valley, Kyrgyzstan.[2]

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 it water. This process changes tyuyamunite into a different mineral known as metatyuyamunite.[5]

References

  1. ^ Handbook of Mineralogy
  2. ^ a b Tyuyamunite on Mindat.org
  3. ^ Tyuyamunite data on Webmineral
  4. ^ Mineral Galleries
  5. ^ a b Lynch, Dan R. and Bob Lynch, "Tyuyamunite," Ed. Brett Ortler, Michigan Rocks & Minerals, Adventure Publications, 2010 ISBN 978-1591932390
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