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Sahamalite-(Ce) Mineral Data

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General Sahamalite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)Ce2(CO3)4
Help on Composition: Composition: Molecular Weight = 552.46 gm
   Cerium     50.72 %  Ce   59.41 % Ce2O3
   Magnesium   3.30 %  Mg    5.47 % MgO
   Iron        2.53 %  Fe    3.25 % FeO
   Carbon      8.70 %  C    31.86 % CO2
   Oxygen     34.75 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.75Fe2+0.25Ce2(CO3)4
Help on Environment: Environment: Accessory mineral in a rare-earth-bearing barite-dolomite carbonatite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: Sulfide Queen mine, Mountain Pass, San Bernardino Co., California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Thure Georg Sahama (1910-1983), Finnish geochemist and petrologist, University of Helsinki, Helsinki, Finland.
Help on Name Pronunciation: Name Pronunciation: Sahamalite-(Ce) + Pronunciation Say SAHAMALITE-(CE)
Help on Synonym: Synonym: ICSD 31271
  PDF 6-189
 

Sahamalite-(Ce) Image

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  Sahamalite-(Ce)

Comments: White granular aggregate of sahamalite-(Ce) on matrix.
Location: Silfide Queen Deposit, Mountain Pass Mine, San Bernandino Co., California, USA. Scale: Specimen Size 9x7x5 mm.
© Sergey Vasiliev / Systematic Mineralogy

Sahamalite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0357:1:0.2856
Help on Cell Dimensions: Cell Dimensions: a = 16.79, b = 16.21, c = 4.63, Z = 6; beta = 106.7° V = 1,206.98 Den(Calc)= 4.56
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.87(1), 3.65(1), 3.9(1),
 

Physical Properties of Sahamalite-(Ce)

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Colorless.
Help on Density: Density: 4.3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Streak: Streak: white
 

Optical Properties of Sahamalite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1654,KPDmeas= 0.1753,KC= 0.1698
Ncalc = 1.73 - 1.77
Help on Optical Data: Optical Data: Biaxial (-), a=1.679, b=1.776, g=1.807, bire=0.1280, 2V(Calc)=56, 2V(Meas)=57.
 

Calculated Properties of Sahamalite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.15 gm/cc
note: Specific Gravity of Sahamalite-(Ce) =4.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0049587627
Boson Index = 0.9950412373
Help on Photoelectric: Photoelectric: PESahamalite-(Ce) = 258.21 barns/electron
U=PESahamalite-(Ce) x relectron=1,072.05 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 49,262.21 (Gamma Ray American Petroleum Institute Units)
Concentration of Sahamalite-(Ce) per GRapi unit = 20.30 (PPM)

Sahamalite-(Ce) 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) 617.44 ±154.36 grams of pure Sahamalite-(Ce) .

Estimated Radioactivity from Sahamalite-(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 / 7.48 cm 1,136,224 3.07E-05 49,262.21 16.20
100 gm / 3.47 cm 113,622 3.07E-06 4,926.22 1.62
10 gm / 1.61 cm 11,362 3.07E-07 492.62 0.16
1 gm / 7.48 mm 1,136 3.07E-08 49.26 0.02
0.1 gm / 3.47 mm 114 3.07E-09 4.93 0.00
0.01 gm / 1.61 mm 11 3.07E-10 0.49 0.00
0.001 gm / 0.75 mm 1 3.07E-11 0.05 0.00

Weight of pure Sahamalite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.56 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 ( 2.54 % Th) From Sum REE Elements (50.72 % REE)
 

Sahamalite-(Ce) Classification

Help on  Dana Class: Dana Class: 14.04.02.01 (14)Anhydrous Carbonates
  (14.04)with Compound Formula A+2 B++2 (CO3)4
  (14.04.02)Dana Group
 
14.04.02.01 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 21/a 2/m
 
14.04.02.02 Paratooite-(La)! REE3(Ca,Sr)2NaCu(CO3)8 P 222 or P 2221 2 2 2
Help on  Strunz Class: Strunz Class: 05.AD.05 05 - CARBONATES (NITRATES)
  05.A - Carbonates without additional anions, without H2O
  05.AD -With rare-earth elements (REE)
 
05.AD.05 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 21/a 2/m
 

Other Sahamalite-(Ce) Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Sahamalite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Sahamalite-(Ce)

(Mg,Fe++)Ce2(CO3)4
Dana No: 14.04.02.01 Strunz No: 05.AD.05
Locality:

 

Notes:

 

 
   
 


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