Mineralogy Database

Fersmite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Fersmite Say FERSMITE
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 - Dipyramidal H-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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.69 - 2.13
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: Bulk Density (Electron Density)=4.29 gm/cc
note: Specific Gravity of Fersmite =4.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0005485184
Boson Index = 0.9994514816
Help on Photoelectric: Photoelectric: PEFersmite = 330.35 barns/electron
U=PEFersmite x relectron=1,418.18 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 57,336.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Fersmite per GRapi unit = 17.44 (PPM)

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 1,329,473 3.59E-05 57,336.83 18.85
100 gm / 3.43 cm 132,947 3.59E-06 5,733.68 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: 08.03.03.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.03)Dana Group
 
08.03.03.01 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: 04.DG.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DG -With large (� medium-sized) cations; chains of edge-sharing octahedra
 
04.DG.05 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m
 
04.DG.05 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
 
04.DG.05 Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6(?) Cubic Cubic
 
04.DG.05 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho
 
04.DG.05 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
04.DG.05 Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m
 
04.DG.05 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
 
04.DG.05 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Fersmite Specimen Label here :

Fersmite

(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6
Dana No: 08.03.03.01 Strunz No: 04.DG.05
Locality:

 

Notes:

 

 
   
 


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