Khristovite-(Ce) Mineral Data

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

Help on Chemical Formula: Chemical Formula: (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)Mn++Al(SiO4)(Si2O7)(OH)(F,O)
Help on Composition: Composition: Molecular Weight = 610.88 gm
   Calcium           5.25 %  Ca    7.34 % CaO
   Cerium           11.47 %  Ce   13.43 % Ce2O3
   La,Ce,Pr,Nd,Sm,  16.50 %  RE   19.25 % REE2O3
   Magnesium         1.59 %  Mg    2.64 % MgO
   Titanium          0.78 %  Ti    1.31 % TiO2
   Manganese         8.99 %  Mn   11.61 % MnO
   Aluminum          4.86 %  Al    9.18 % Al2O3
   Vanadium          0.42 %  V     0.61 % V2O3
   Chromium          0.85 %  Cr    1.24 % Cr2O3
   Iron              0.91 %  Fe    1.18 % FeO
   Silicon          13.79 %  Si   29.51 % SiO2
   Hydrogen          0.16 %  H     1.47 % H2O
   Oxygen           32.08 %  O
   Fluorine          2.33 %  F     2.33 % F
                      -   %   F    -0.98 % -O=F2    
                   ______        ______ 
                   100.00 %      100.13 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.8REE0.2Ce0.5REE0.5Mg0.4Fe2+0.1Cr0.1Ti0.1V3+0.05Mn2+Al1.1(SiO4)(Si2O7)(OH)F0.75O0.25
Help on Environment: Environment: Occurs in rhodonite in garnet-biotite-quartz-rich exo-contact of the subalkaline granites of the Inyl'chek massif.
Help on IMA Status: IMA Status: Approved IMA 1991 - Dana Number Modified from 58.2.1a.9
Help on Locality: Locality: On the northern slope of the Inyl'chek Range, southwestern Tien-shan, Kirgiziya, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Evgenia Valdimirovicha Khristova (1933-), Russian geologist and specialist in Tien-shan geology.
Help on Name Pronunciation: Name Pronunciation: Khristovite-(Ce) + Pronunciation Say KHRISTOVITE-(CE)
Help on Synonym: Synonym: IMA1991-055
 

Khristovite-(Ce) Image

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Khristovite-(Ce)

Comments: Three tabular crystals of reddish-brown khristovite-(Ce) in pink rhodonite matrix. Associated mineral is yellowish-brown Fe-free hejtmanite (inylchekite var.).
Location: Rhodonite occurrence, Muzeinyi Valley, Inyl'chek Range, Issyk-Kul'skaya Oblast, Kyrgyzstan. Scale: Picture Size 3x1.7 mm.
© Pavel M. Kartashov

Khristovite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.5488:1:1.7583
Help on Cell Dimensions: Cell Dimensions: a = 8.903, b = 5.748, c = 10.107, Z = 2; beta = 113.41° V = 474.65 Den(Calc)= 4.27
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.91(1), 2.63(0.8), 2.73(0.7),
 

Physical Properties of Khristovite-(Ce)

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Brown, Dark brown.
Help on Density: Density: 4.05 - 4.11, Average = 4.08
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish
 

Optical Properties of Khristovite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1847,KPDmeas= 0.1933,KC= 0.1872
Ncalc = 1.76 - 1.8
Help on Optical Data: Optical Data: Biaxial (-), a=1.773, b=1.79, g=1.803, bire=0.0300, 2V(Calc)=80, 2V(Meas)=83. Dispersion r < v medium.
 

Calculated Properties of Khristovite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.02 gm/cc
note: Specific Gravity of Khristovite-(Ce) =4.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEKhristovite-(Ce) = 159.83 barns/electron
U=PEKhristovite-(Ce) x relectron= 643.26 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 28,179.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Khristovite-(Ce) per GRapi unit = 35.49 (PPM)

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

Estimated Radioactivity from Khristovite-(Ce) - weak
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 / 7.65 cm 627,829 1.70E-05 28,179.57 9.26
100 gm / 3.55 cm 62,783 1.70E-06 2,817.96 0.93
10 gm / 1.65 cm 6,278 1.70E-07 281.80 0.09
1 gm / 7.65 mm 628 1.70E-08 28.18 0.01
0.1 gm / 3.55 mm 63 1.70E-09 2.82 0.00
0.01 gm / 1.65 mm 6 1.70E-10 0.28 0.00
0.001 gm / 0.76 mm 1 1.70E-11 0.03 0.00

Weight of pure Khristovite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.27 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
Estimated Thorium Activity ( 1.40 % Th) From Sum REE Elements (27.97 % REE)
 

Khristovite-(Ce) Classification
Help on Dana Class: Dana Class: 58.02.01d.02 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.01d)Epidote group (Dollaseite subgroup)
 
58.02.01d.01 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 21/m 2/m
 
58.02.01d.02 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 21/m 2/m
Help on Strunz Class: Strunz Class: 09.BG.05c 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.05c Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 21/m 2/m
 
09.BG.05c Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 21/m 2/m
 

Other Khristovite-(Ce) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Khristovite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Khristovite-(Ce)

(Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)Mn++Al(SiO4)(Si2O7)(OH)(F,O)
Dana No: 58.02.01d.02 Strunz No: 09.BG.05c
Locality:

 

Notes: