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CaO · 6UO3 · 2MoO3 · 12H2O
2 - 2½
Crystal System:
Named after its discovery locality, Tengchong District, Yunnan Province, China.
This page provides mineralogical data about Tengchongite.

Hide all sections | Show all sections

Classification of TengchongiteHide

Approval Year:

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+

3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen

27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates

Physical Properties of TengchongiteHide

Transparent, Translucent
2 - 2½ on Mohs scale

Optical Data of TengchongiteHide

Biaxial (-)
RI values:
nα = 1.663 nβ = 1.760 nγ = 1.762
Measured: 16° , Calculated: 14°
Max Birefringence:
δ = 0.099
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of TengchongiteHide

CaO · 6UO3 · 2MoO3 · 12H2O
IMA Formula:
Ca(UO2)6(MoO4)2O5 · 12H2O

Crystallography of TengchongiteHide

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

Type Occurrence of TengchongiteHide

Synonyms of TengchongiteHide

Other Language Names for TengchongiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.HB.15Calcurmolite(Ca,Na)2(UO2)3Mo2(O,OH)11 · nH2O
7.HB.25Uranotungstite(Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2OOrth.

Related Minerals - Dana Grouping (8th Ed.)Hide,Na)2(UO2)3Mo2(O,OH)11 · nH2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

27.3.1LindgreniteCu3(MoO4)2(OH)2Mon. 2/m : P21/m
27.3.2PowelliteCa(MoO4)Tet. 4/m : I41/a
27.3.3WulfenitePb(MoO4)Tet. 4/m : I41/a
27.3.4KoechliniteBi2MoO6Orth. mm2 : Pna21
27.3.7Iriginite(UO2)Mo2O7 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
27.3.8Umohoite(UO2)MoO4 · 2H2OTric.
27.3.9MoluraniteH4U4+(UO2)3(MoO4)7 · 18H2O
27.3.10CousiniteMgU2Mo2O11 · 6H2O
27.3.11Calcurmolite(Ca,Na)2(UO2)3Mo2(O,OH)11 · nH2O
27.3.14FerrimolybditeFe2(MoO4)3 · nH2OOrth. mmm (2/m 2/m 2/m) : Pmmn

Other InformationHide

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

References for TengchongiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 TengchongiteHide

Localities for TengchongiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China (TL)
  • Yunnan
    • Baoshan
      • Tengchong Co.
Chen Zhangru, Luo Keding, Tan Falan, Zhang Yi, and Gu Xiaofa (1986): Kexue Tongbao [Science Bulletin] 31, 396-401.
    • Dehong
      • 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)] ; Chen Zhangru, Huang Yuzhu, and Gu Xiaofa (1990): A new uranium mineral - Yingjiangite. Acta Mineralogica Sinica 10(2), 102-105.
  • Zabaykalsky Krai
    • Chitinskaya Oblast
      • Krasnokamensk
        • Strel'tsovskoe Mo-U ore field
M.E. Ciriotti (2005) Probed
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