Dingdaohengite-(Ce) Mineral Data (original) (raw)

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),

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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 R 2 ∑ 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

RelativeIntensity 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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor 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: