Dingdaohengite-(Ce) Mineral Data

Dingdaohengite-(Ce) Mineral Data
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General Dingdaohengite-(Ce) Information

Help on Chemical Formula: Chemical Formula: (Ce,La)4Fe++(Ti,Fe++,Mg,Fe+++)2Ti2Si4O22
Help on Composition: Composition: Molecular Weight = 1,237.85 gm
   Calcium     1.55 %  Ca    2.17 % CaO
   Lanthanum  16.72 %  La   19.61 % La2O3
   Cerium     24.11 %  Ce   28.24 % Ce2O3
   Thorium     0.19 %  Th    0.21 % ThO2
   Magnesium   0.81 %  Mg    1.33 % MgO
   Titanium   10.99 %  Ti   18.33 % TiO2
   Niobium     0.30 %  Nb    0.43 % Nb2O5
   Aluminum    0.02 %  Al    0.04 % Al2O3
   Iron        7.81 %  Fe    8.53 % FeO /  1.68 % Fe2O3
   Silicon     9.08 %  Si   19.42 % SiO2
   Oxygen     28.44 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce2.13La1.49Ca0.48Th0.01Fe2+Ti0.88Fe2+0.47Mg0.41Fe3+0.26Al0.01Ti1.96Nb0.04(Si2O7)2O8
Help on Environment: Environment: Occurs in the magnesian skarn in the excontact of granite within dolomitic marble. Chevkinite group (pseudo-C2/m).
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Bayun Obo iron mine, Inner Mongolia, China Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ding Daoheng (1899-1955), who made the first discovery of the world-famous Bayan Obo REE-Nb-Fe ore deposit in 1927.
Help on Synonym: Synonym: IMA2005-014
 

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Dingdaohengite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =2.3477:1:1.9352
Help on Cell Dimensions: Cell Dimensions: a = 13.4656, b = 5.7356, c = 11.0997, Z = 2; beta = 100.636° V = 842.54 Den(Calc)= 4.88
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a (pseudo-C 2/m)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.7524(1), 2.7263(0.98), 3.198(0.68),2.546(0.54), 2.8702(0.52), 3.162(0.46), 3.095(0.39), 3.342(0.39),
Click Here for Large Dingdaohengite-(Ce) Structure Window Crystal Structure:

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Li G , Yang G , Ma Z , Shi N , Xiong M , Sheng G , Fan H , Kuangwu Xuebao , 25 (2005) p.313-320, The crystal structure of a new mineral dingdaohengite-(Ce), Locality: Bayun Obo, Inner Mongolia, China

 

Physical Properties of Dingdaohengite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Brownish black.
Help on Density: Density: 4.83
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Moderate electrormagnetic
Help on Streak: Streak: brown
 

Optical Properties of Dingdaohengite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2037,KPDmeas= 0.2058,KC= 0.2123
Ncalc = 2.03 - 2.04
Help on Optical Data: Optical Data: Biaxial (-), a=1.978, g=2.01, bire=0.0320
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: Weak.
Help on RL Color: RL Color: Grayish yellow.
Help on RL Pleochroism: RL Pleochroism: Observed in different gray tones.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Dingdaohengite-(Ce) in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   10.60   10.40 
   
 420 nm   10.60   10.90 
 440 nm   10.60   10.80 
 460 nm   11.00   11.00 
 470 nm   11.40   11.80 
 480 nm   11.60   11.80 
 500 nm   11.60   11.80 
 560 nm   11.40   12.10 
 580 nm   11.20   11.90 
 589 nm   11.00   12.50 
 600 nm   10.70   11.80 
 620 nm   10.70   11.70 
 640 nm   10.40   11.60 
 650 nm   10.10   11.80 
Calculated Relative Intensity Colors of Dingdaohengite-(Ce) in Air
Relative
Intensity		    0%   90% 100% 180% 270% 360% 450% 540% 630% 720% 810% 820%
R1                        
R2                        
 

Calculated Properties of Dingdaohengite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Dingdaohengite-(Ce) =4.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEDingdaohengite-(Ce) = 210.42 barns/electron
U=PEDingdaohengite-(Ce) x relectron= 927.96 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,651.37 (Gamma Ray American Petroleum Institute Units)
Concentration of Dingdaohengite-(Ce) per GRapi unit = 273.87 (PPM)

Dingdaohengite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Dingdaohengite-(Ce) - mild
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Becquerels
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.34 cm 83,979 2.27E-06 3,651.37 1.20
100 gm / 3.41 cm 8,398 2.27E-07 365.14 0.12
10 gm / 1.58 cm 840 2.27E-08 36.51 0.01
1 gm / 7.34 mm 84 2.27E-09 3.65 0.00
0.1 gm / 3.41 mm 8 2.27E-10 0.37 0.00
0.01 gm / 1.58 mm 1 2.27E-11 0.04 0.00
0.001 gm / 0.73 mm 0 2.27E-12 0.00 0.00

Weight of pure Dingdaohengite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.83 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
 

Dingdaohengite-(Ce) Classification
Help on Dana Class: Dana Class: 56.02.08.09 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.08)Perierite - Chevkinite group
 
56.02.08.01 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m
 
56.02.08.02 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m
 
56.02.08.03 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m
 
56.02.08.04 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho
 
56.02.08.05 Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m
 
56.02.08.06 Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m
 
56.02.08.07 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m
 
56.02.08.08 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m
 
56.02.08.09 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 21/a (pseudo-C 2/m) 2/m
Help on Strunz Class: Strunz Class: 09.BE.70 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.70 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m
 
09.BE.70 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex
 
09.BE.70 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m
 
09.BE.70 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m
 
09.BE.70 Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m
 
09.BE.70 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m
 
09.BE.70 Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m
 
09.BE.70 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m
 
09.BE.70 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 21/a (pseudo-C 2/m) 2/m
 

Other Dingdaohengite-(Ce) Information
Help on References: References: NAME( AmMin, v93:740) PHYS. PROP.(AmMin, v93:740) OPTIC PROP.(AmMin, v93:740)
Help on See Also: See Also: Links to other databases for Dingdaohengite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Dingdaohengite-(Ce) Specimen Label here :

Dingdaohengite-(Ce)

(Ce,La)4Fe++(Ti,Fe++,Mg,Fe+++)2Ti2Si4O22
Dana No: 56.02.08.09 Strunz No: 09.BE.70
Locality:

 

Notes: