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Tengchongite

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
[(OH)
 
4
|WO
 
4
] · 12H
 
2
O
Related Minerals - Hey's Index Grouping:
27.3.1Lindgrenite
Cu
 
3
[OH|MoO
 
4
]
 
2
27.3.2Powellite
Ca[MoO
 
4
]
27.3.3Wulfenite
Pb[MoO
 
4
]
27.3.4Koechlinite
(BiO)
 
2
[MoO
 
4
]
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
·4H
 
2
O
27.3.9Moluranite
U(UO
 
2
)
 
2
Mo
 
5
O
 
19
·12H
 
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
German names:
Tengchongit
Spanish names:
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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    Localities for Tengchongite

    (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'tsovskoye ore field
    		M.E. Ciriotti (2005) Probed
    Mineral and/or Locality
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