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Tengchongite

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Formula:
CaO · 6UO
 
3
 · 2MoO
 
3
 · 12H
 
2
O
System:OrthorhombicColour:Yellow
Hardness:2 - 2½
Name:Named after its discovery locality, Tengchong District, Yunnan Province, China.
This page provides mineralogical data about Tengchongite.

Classification of Tengchongite

IMA status:Approved 1984
Strunz 8th edition ID:6/G.06-20
Nickel-Strunz 10th (pending) edition ID:7.HB.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+
Dana 8th edition ID:49.3.1.2

49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
Hey's CIM Ref.:27.3.12

27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
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Type Occurrence of Tengchongite

Type Locality:Unnamed U deposit, Tengchong Co., Baoshan Prefecture, Yunnan Province, China
Year of Discovery:1986

Physical Properties of Tengchongite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Yellow
Hardness (Mohs):2 - 2½

Crystallography of Tengchongite

Crystal System:Orthorhombic
Cell Parameters:a = 15.61Å, b = 13.04Å, c = 17.71Å
Ratio:a:b:c = 1.197 : 1 : 1.358
Unit Cell Volume:V 3,604.95 ų (Calculated from Unit Cell)

Optical Data of Tengchongite

Type:Biaxial (-)
RI values: nα = 1.663 nβ = 1.760 nγ = 1.762
2V:Measured: 16° , Calculated: 14°
Maximum Birefringence:δ = 0.099

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:weak

Chemical Properties of Tengchongite

Formula:
CaO · 6UO
 
3
 · 2MoO
 
3
 · 12H
 
2
O
Essential elements:Ca, H, Mo, O, U
All elements listed in formula:Ca, H, Mo, O, U

Relationship of Tengchongite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.HB.15Calcurmolite
(Ca,Na)
 
2
(UO
 
2
)
 
3
Mo
 
2
(O,OH)
 
11
 · nH
 
2
O
7.HB.25Uranotungstite
(Fe
2+
 
,Ba,Pb)(UO
 
2
)
 
2
(WO
 
4
)(OH)
 
4
 · 12H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
27.3.1Lindgrenite
Cu
 
3
(MoO
 
4
)
 
2
(OH)
 
2
27.3.2Powellite
Ca(MoO
 
4
)
27.3.3Wulfenite
Pb(MoO
 
4
)
27.3.4Koechlinite
Bi
 
2
MoO
 
6
27.3.5Sedovite
U(MoO
 
4
)
 
2
27.3.6Mourite
UMo
 
5
O
 
12
(OH)
 
10
27.3.7Iriginite
(UO
 
2
)Mo
 
2
O
 
7
 · 3H
 
2
O
27.3.8Umohoite
(UO
 
2
)MoO
 
4
 · 2H
 
2
O
27.3.9Moluranite
H
 
4
U
4+
 
(UO
 
2
)
 
3
(MoO
 
4
)
 
7
 · 18H
 
2
O
27.3.10Cousinite
MgU
 
2
Mo
 
2
O
 
11
 · 6H
 
2
O
27.3.11Calcurmolite
(Ca,Na)
 
2
(UO
 
2
)
 
3
Mo
 
2
(O,OH)
 
11
 · nH
 
2
O
27.3.13Kamiokite
Fe
 
2
Mo
 
3
O
 
8
27.3.14Ferrimolybdite
Fe
 
2
(MoO
 
4
)
 
3
 · nH
 
2
O

Other Names for Tengchongite

Synonyms:
IMA1984-031
Other Languages:
German:Tengchongit
Spanish:Tengchongita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tengchongite

Reference List:

- +
Chen Zhangru, Luo Keding, Tan Falan, Zhang Yi, and Gu Xiaofa (1986): Tengchongite, a new mineral of hydrated calcium uranyl molybdate. Kexue Tongbao [Science Bulletin] 31, 396-401 (in Chinese). - American Mineralogist (1988), 73, 195-196 (abstract).

Internet Links for Tengchongite

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  • Raman and XRD data at RRUFF project
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    • Localities for Tengchongite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    China
     
    • Yunnan Province
      • Baoshan Prefecture
        • Tengchong Co.
    		Chen Zhangru, Luo Keding, Tan Falan, Zhang Yi, and Gu Xiaofa (1986): Kexue Tongbao [Science Bulletin] 31, 396-401.
      • Dehong Autonomous Prefecture
        • Yingjiang Co.
          • Tongbiguan
    		Chen, Z., Huang, Y. & Gu, X. (1990): A new uranium mineral - yingjiangite. Kuangwu Xuebao [Acta Mineral. Sinica] 10, 102-105. (in Chinese)[Am. Min. 76, 1731(1991)(abstract)]
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Chitinskaya Oblast'
          • Krasnokamensk
            • Strel'tsovskoe Mo-U ore field
    		M.E. Ciriotti (2005) Probed
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 14:42:36
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