Franklinite Mineral Data + Say FRANKLINITE


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General Franklinite Information
Help on Chemical Formula: Chemical Formula: (Zn,Mn++,Fe++)(Fe+++,Mn+++)2O4
Help on Composition: Composition: Molecular Weight = 236.54 gm
   Manganese  18.58 %  Mn    9.00 % MnO / 16.69 % Mn2O3
   Zinc       16.59 %  Zn   20.65 % ZnO
   Iron       37.78 %  Fe    3.04 % FeO / 50.63 % Fe2O3
   Oxygen     27.06 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn0.6Mn2+0.3Fe2+0.1Fe3+1.5Mn3+0.5O4
Help on Environment: Environment: Zinc rich orebody weathered and later metamorphosed..
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1819
Help on Locality: Locality: Dominant ore mineral at Franklin and Sterling Hill, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality which was named after Benjamin Franklin (1706-1790), American scientist and inventor.
Help on Synonym: Synonym: ICSD 81205
  PDF 22-1012
 

Franklinite Image

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Franklinite

Comments: Black, octahedral franklinite crystals to 1.4 cm across on white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: 2.9 x 2 cm.
© John Veevaert
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Franklinite   Esperite   Hardystonite

Comments: Pale brown porcelaneous esperite with pinkish gray hardystonite and black franklinite.
Location: Franklin, Sussex County, New Jersey. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Franklinite Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 8.42, Z = 8; V = 596.95 Den(Calc)= 5.26
Help on Crystal System: Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.55(1), 1.499(0.8), 2.99(0.7),
Help on Forms: Forms:

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Forms: [ 1 1 1] [ 1 0 0]

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Pavese A , Levy D , Hoser A , American Mineralogist , 85 (2000) p.1497-1502, Cation distribution in synthetic zinc ferrite (Zn0.97Fe2.02O4) from, in situ high temperature neutron powder diffraction, Sample at T = 300 K

View Additional jPOWD Structure files for Franklinite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [4] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [5] [50] [51] [6] [7] [8] [9]
 

Physical Properties of Franklinite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Brownish black.
Help on Density: Density: 5.07 - 5.22, Average = 5.14
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Naturally weak
Help on Streak: Streak: reddish brown
 

Optical Properties of Franklinite

Help on Optical Data: Optical Data: Isotropic, n=2.36.
Help on RL Color: RL Color: White to gray, with dark red internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Franklinite in Air
λ R  ∑ R(λ) 
 400 nm   19.20   
 420 nm   19.20 
 440 nm   19.20 
 460 nm   19.20 
 480 nm   19.20 
 500 nm   19.10 
 520 nm   19.00 
 540 nm   18.60 
 560 nm   18.20 
 580 nm   17.80 
 600 nm   17.40 
 620 nm   17.10 
 640 nm   16.80 
 660 nm   16.60 
 680 nm   16.40 
 700 nm   16.30 
Calculated Relative Intensity Colors of Franklinite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 510%
R                      
 

Calculated Properties of Franklinite

Help on Electron Density: Electron Density:

relectron=4.96 gm/cc
note: rFranklinite =5.26 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01493
Boson Index = 0.98507
Help on Photoelectric: Photoelectric:

PEFranklinite = 24.90 barns/electron
U=PEFranklinite x relectron= 123.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Franklinite is Not Radioactive
 

Franklinite Classification
Help on Dana Class: Dana Class: 7.2.2.4 (7)Multiple Oxides
  (7.2)(A+ B++)2 X4 Spinel group
  (7.2.2)(Iron subgroup)
 
7.2.2.1 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m
 
7.2.2.2 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
7.2.2.3 Magnetite FeFe2O4 F d3m 4/m 3 2/m
 
7.2.2.4 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
7.2.2.5 Trevorite NiFe2O4 F d3m 4/m 3 2/m
 
7.2.2.6 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m
 
7.2.2.7 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m
Help on Strunz Class: Strunz Class: IV/B.02-60 IV - Oxides
  IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), Ferrite-Spinels
  IV/B.02 - Spinel group, Magnesioferrite - Franklinite series
 
IV/B.02-10 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m
 
IV/B.02-20 Magnetite FeFe2O4 F d3m 4/m 3 2/m
 
IV/B.02-30 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
IV/B.02-40 Trevorite NiFe2O4 F d3m 4/m 3 2/m
 
IV/B.02-50 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m
 
IV/B.02-60 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 

Other Franklinite Information
Help on References: References: NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Franklinite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Franklin Minerals(Dunn) 8 - Franklin Minerals(Palache) 9 - Glendale Community College 10 -Google Images 11 -Google Scholar 12 -Handbook of Mineralogy (UofA) 13 -MinDAT 14 -MinMax(Deutsch) 15 -MinMax(English) 16 - Mineral and Gemstone Kingdom 17 -Mineralienatlas (Deutsch) 18 -Minerals of Franklin and Sterling Hill 19 -QUT Mineral Atlas 20 - WWW-MINCRYST 21 - YupRocks 22 -École des Mines de Paris

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

Franklinite

(Zn,Mn++,Fe++)(Fe+++,Mn+++)2O4
Dana No: 7.2.2.4 Strunz No: IV/B.02-60
Locality:

 

Notes:

 
 
   
 
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