Fersmite Mineral Data + Say FERSMITE

General Fersmite Information
Help on Chemical Formula: Chemical Formula: (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6
Help on Composition: Composition: Molecular Weight = 390.96 gm
   Sodium     0.59 %  Na    0.79 % Na2O
   Calcium    7.18 %  Ca   10.04 % CaO
   Cerium     7.17 %  Ce    8.40 % Ce2O3
   Yttrium    2.27 %  Y     2.89 % Y2O3
   Thorium    2.97 %  Th    3.38 % ThO2
   Tantalum  13.89 %  Ta   16.95 % Ta2O5
   Titanium   0.24 %  Ti    0.41 % TiO2
   Niobium   40.40 %  Nb   57.79 % Nb2O5
   Hydrogen   0.26 %  H     2.30 % H2O
   Oxygen    24.55 %  O
   Fluorine   0.49 %  F     0.49 % F
               -   %  F    -0.20 % -O=F2
            ______        ______ 
            100.00 %      103.23 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.7Ce0.2Y0.1Na0.1Th0.05Nb1.7Ta0.3Ti0.02O5(OH)F0.1
Help on Environment: Environment: Accessory mineral in nepheline syenites and carbonatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1946
Help on Locality: Locality: Lake Buldym, Vishnevy-Ilmen Mountains, Southern Ural Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Aleksandr Evgenevich Fersman (1883-1945), eminent Russian mineralogist, geochemist, and gemologist.
Help on Synonym: Synonym: ICSD 77474
  PDF 39-1392
 

Fersmite Image

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Fersmite

Comments: Brown prismatic crystal of fersmite in matrix.
Location: Alpe Rosso, Vigezzo valley, Novara, Piedmont, Italy. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Fersmite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.3835:1:0.3501
Help on Cell Dimensions: Cell Dimensions: a = 5.718, b = 14.91, c = 5.221, Z = 2; V = 445.12 Den(Calc)= 2.92
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcan
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.049(1), 3.762(0.21), 1.527(0.15),
 

Physical Properties of Fersmite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black, Dark brown, Black.
Help on Density: Density: 4.69 - 4.79, Average = 4.74
Help on Diaphaniety: Diaphaniety: Subtranslucent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: grayish brown
 

Optical Properties of Fersmite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.62 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3813,KPDmeas= 0.2349,KC= 0.2354
Help on Optical Data: Optical Data: Biaxial (+), a=2.07, b=2.08, g=2.19, bire=0.1200, 2V(Calc)=36, 2V(Meas)=20-25.
Help on Pleochroism (x): Pleochroism (x): pale greenish yellow or colorless.
Help on Pleochroism (y): Pleochroism (y): pale greenish yellow or colorless.
Help on Pleochroism (z): Pleochroism (z): dark greenish yellow or olive yellow.
 

Calculated Properties of Fersmite

Help on Electron Density: Electron Density:

relectron=4.29 gm/cc
note: rFersmite =4.74 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00054
Boson Index = 0.99946
Help on Photoelectric: Photoelectric:

PEFersmite = 330.36 barns/electron
U=PEFersmite x relectron=1,418.18 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 57,336.70 (Gamma Ray American Petroleum Institute Units)

Fersmite 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) 530.49 ±132.62 grams of pure Fersmite .

Estimated Radioactivity from Fersmite - 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 / 7.39 cm 1,329,471 3.59E-05 57,336.70 18.85
100 gm / 3.43 cm 132,947 3.59E-06 5,733.67 1.89
10 gm / 1.59 cm 13,295 3.59E-07 573.37 0.19
1 gm / 7.39 mm 1,329 3.59E-08 57.34 0.02
0.1 gm / 3.43 mm 133 3.59E-09 5.73 0.00
0.01 gm / 1.59 mm 13 3.59E-10 0.57 0.00
0.001 gm / 0.74 mm 1 3.59E-11 0.06 0.00

Weight of pure Fersmite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.74 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
 

Fersmite Classification
Help on Dana Class: Dana Class: 8.3.3.1 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.3)where A (B2O6)
  (8.3.3)Dana Group
 
8.3.3.1 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.19-30 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.19 - Polycrase-(Y) - Loranskite-(Y) series
 
IV/D.19-10 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
IV/D.19-15 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
 
IV/D.19-20 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho
 
IV/D.19-30 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m
 
IV/D.19-40 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
 
IV/D.19-60 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m
 
IV/D.19-70 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho
 
IV/D.19-80 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho
 
IV/D.19-90 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m
 
IV/D.19-100 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho
 

Other Fersmite Information
Help on References: References: NAME( AntBidBlaNic3) 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 Fersmite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Fersmite

(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6
Dana No: 8.3.3.1 Strunz No: IV/D.19-30
Locality:

 

Notes:

 
 
   
 
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