Tyuyamunite: Difference between revisions
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Chris.urs-o (talk | contribs) infobox |
Chris.urs-o (talk | contribs) infobox |
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| alt = |
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| caption = Tyuyamunite |
| caption = Tyuyamunite |
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| category = |
| category = vanadate mineral |
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| formula = Ca(UO<sub>2</sub>)<sub>2</sub>V<sub>2</sub>O<sub>8</sub>·(5-8)H<sub>2</sub>O |
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| formula = |
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| strunz = |
| strunz = 4.HB.25 |
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| dana = |
| dana = 40.2a.26.1 |
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| symmetry = |
| symmetry = |
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| unit cell = |
| unit cell = a = 10.63Å, b = 28.36Å, c = 20.4Å |
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| molweight = |
| molweight = |
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| color = |
| color = |
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| colour = canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight) |
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| colour = |
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| habit = |
| habit = |
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| system = |
| system = Orthorhombic |
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| twinning = |
| twinning = |
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| cleavage = |
| cleavage = Perfect on {001}, micaceous; distinct on {100} & {010} |
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| fracture = |
| fracture = micaceous |
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| tenacity = |
| tenacity = |
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| mohs = |
| mohs = 1½ - 2 |
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| luster = |
| luster = adamantine, waxy, pearly, dull |
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| streak = |
| streak = |
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| diaphaneity = |
| diaphaneity = translucent, opaque |
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| gravity = |
| gravity = |
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| density = |
| density = 3.57 - 4.35 g/cm<sup>3</sup> |
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| polish = |
| polish = |
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| opticalprop = |
| opticalprop = |
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| refractive = |
| refractive = |
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| birefringence = |
| birefringence = 0.210 - 0.220 |
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| pleochroism = |
| pleochroism = weak |
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| 2V = |
| 2V = 30° to 45° |
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| dispersion = |
| dispersion = none |
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| extinction = |
| extinction = |
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| length fast/slow = |
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'''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 |
'''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> |
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== Formation and transformation == |
== Formation and transformation == |
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Revision as of 14:45, 28 May 2013
| Tyuyamunite | |
|---|---|
 Tyuyamunite | |
| General | |
| Category | vanadate mineral |
| Formula (repeating unit) | Ca(UO2)2V2O8·(5-8)H2O |
| Strunz classification | 4.HB.25 |
| Dana classification | 40.2a.26.1 |
| Crystal system | Orthorhombic |
| Unit cell | a = 10.63Å, b = 28.36Å, c = 20.4Å |
| Identification | |
| Colour | canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight) |
| Cleavage | Perfect on {001}, micaceous; distinct on {100} & {010} |
| Fracture | micaceous |
| Mohs scale hardness | 1½ - 2 |
| Luster | adamantine, waxy, pearly, dull |
| Diaphaneity | translucent, opaque |
| Density | 3.57 - 4.35 g/cm3 |
| Birefringence | 0.210 - 0.220 |
| Pleochroism | weak |
| 2V angle | 30° to 45° |
| Dispersion | none |
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.[1] 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.[1]
References
- ^ a b Lynch, Dan R. and Bob Lynch, "Tyuyamunite," Ed. Brett Ortler, Michigan Rocks & Minerals, Adventure Publications, 2010 ISBN 978-1591932390
- ^ Tyuyamunite on Mindat.org
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