Mineralogy Database

Tengchongite Mineral Data

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General Tengchongite Information

Help on Chemical  Formula: Chemical Formula: CaU++++++6Mo++++++2O25•12(H2O)
Help on Composition: Composition: Molecular Weight = 2,276.30 gm
   Calcium      1.76 %  Ca    2.46 % CaO
   Uranium     62.74 %  U    75.39 % UO3
   Molybdenum   8.43 %  Mo   12.65 % MoO3
   Hydrogen     1.06 %  H     9.50 % H2O
   Oxygen      26.01 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaU6Mo2O25•12(H2O)
Help on Environment: Environment: In the oxidized portions of a uranium deposit in migmatite and gneiss.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Tongbiguan village, Tengchong Co., Yunnan Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tengchongite + Pronunciation Say TENGCHONGITE
 

Tengchongite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1972:1:1.3582
Help on Cell Dimensions: Cell Dimensions: a = 15.616, b = 13.043, c = 17.716, Z = 4; V = 3,608.39 Den(Calc)= 4.19
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: A2122
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.84(1), 3.17(0.8), 3.38(0.7),
 

Physical Properties of Tengchongite

Help on Color: Color: Yellow.
Help on Density: Density: 4.25
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow
 

Optical Properties of Tengchongite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.096 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1738,KPDmeas= 0.1714,KC= 0.1564
Ncalc = 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.663, b=1.76, g=1.762, bire=0.0990, 2V(Calc)=14, 2V(Meas)=16.
 

Calculated Properties of Tengchongite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.64 gm/cc
note: Specific Gravity of Tengchongite =4.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETengchongite =1,675.23 barns/electron
U=PETengchongite x relectron=6,105.40 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,586,016.19 (Gamma Ray American Petroleum Institute Units)
Concentration of Tengchongite per GRapi unit = 218.05 (PPB)

Tengchongite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 6.63 ± 1.66 grams of pure Tengchongite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 663.25 ±165.81 grams of pure Tengchongite .

Estimated Radioactivity from Tengchongite - very strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.66 cm 112,306,403 3.04E-03 4,586,016.19 1,507.73
100 gm / 3.56 cm 11,230,640 3.04E-04 458,601.62 150.77
10 gm / 1.65 cm 1,123,064 3.04E-05 45,860.16 15.08
1 gm / 7.66 mm 112,306 3.04E-06 4,586.02 1.51
0.1 gm / 3.56 mm 11,231 3.04E-07 458.60 0.15
0.01 gm / 1.65 mm 1,123 3.04E-08 45.86 0.02
0.001 gm / 0.77 mm 112 3.04E-09 4.59 0.00

Weight of pure Tengchongite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.25 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Tengchongite Classification

Help on  Dana Class: Dana Class: 49.03.01.02 (49)Basic and Hydrated Molybdates and Tungstates
  (49.03)(Hydrated, containing Hydroxyl or Halogen)
  (49.03.01)Calcurmolite Group
 
49.03.01.01 Calcurmolite Ca(UO2)3(MoO4)3(OH)2•11(H2O) Unk Mono
 
49.03.01.02 Tengchongite CaU6Mo2O25•12(H2O) A2122 2 2 2
Help on  Strunz Class: Strunz Class: 07.HB.20 07 - SULFATES (SELENATES, TELLURATES)
  07.H - Uranium and Uranyl Molybdates and Wolframates
  07.HB -With U6+
 
07.HB.20 Tengchongite CaU6Mo2O25•12(H2O) A2122 2 2 2
 

Other Tengchongite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.73,p195,1988) OPTIC PROP.(Am.Min.,Vol.73,p195,1988)
Help on See Also: See Also: Links to other databases for Tengchongite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Print or Cut-and-Paste your Tengchongite Specimen Label here :

Tengchongite

CaU++++++6Mo++++++2O25•12(H2O)
Dana No: 49.03.01.02 Strunz No: 07.HB.20
Locality:

 

Notes:

 

 
   
 


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