General Franklinite Information
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Chemical Formula: |
(Zn,Mn++,Fe++)(Fe+++,Mn+++)2O4 |
Composition: |
Molecular Weight = 236.54 gm |
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Manganese 18.58 % Mn 9.00 % MnO / 16.69 % Mn2O3 |
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Zinc 16.59 % Zn 20.65 % ZnO |
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Iron 37.78 % Fe 3.04 % FeO / 50.63 % Fe2O3 |
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Oxygen 27.06 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Zn0.6Mn2+0.3Fe2+0.1Fe3+1.5Mn3+0.5O4 |
Environment: |
Zinc rich orebody weathered and later metamorphosed.. |
IMA Status: |
Valid Species (Pre-IMA) 1819 |
Locality: |
Dominant ore mineral at Franklin and Sterling Hill, New Jersey, USA. Link to MinDat.org Location Data. |
Name Origin: |
Named after its locality which was named after Benjamin Franklin (1706-1790), American scientist and inventor. |
Synonym: |
ICSD 81205 |
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PDF 22-1012 |
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Franklinite Image |
Images:
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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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Images:
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Franklinite Crystallography
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Cell Dimensions: |
a = 8.42, Z = 8; V = 596.95 Den(Calc)= 5.26 |
Crystal System: |
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m |
X Ray Diffraction: |
By Intensity(I/Io): 2.55(1), 1.499(0.8), 2.99(0.7), |
Forms:
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Crystal Structure:
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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
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Physical Properties of Franklinite
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Cleavage: |
None |
Color: |
Black, Brownish black. |
Density: |
5.07 - 5.22, Average = 5.14 |
Diaphaniety: |
Opaque |
Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
Habit: |
Crystalline - Fine - Occurs as well-formed fine sized crystals. |
Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
Hardness: |
5.5-6 - Knife Blade-Orthoclase |
Luminescence: |
None. |
Luster: |
Sub Metallic |
Magnetism: |
Naturally weak |
Streak: |
reddish brown |
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Optical Properties of Franklinite
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Optical Data: |
Isotropic, n=2.36. |
RL Color: |
White to gray, with dark red internal reflections. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Franklinite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
19.20 |
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| 420 nm |
19.20 |
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| 440 nm |
19.20 |
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| 460 nm |
19.20 |
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| 480 nm |
19.20 |
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| 500 nm |
19.10 |
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| 520 nm |
19.00 |
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| 540 nm |
18.60 |
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| 560 nm |
18.20 |
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| 580 nm |
17.80 |
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| 600 nm |
17.40 |
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| 620 nm |
17.10 |
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| 640 nm |
16.80 |
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| 660 nm |
16.60 |
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| 680 nm |
16.40 |
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| 700 nm |
16.30 |
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Calculated Relative Intensity Colors of Franklinite in Air
Relative Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
510% |
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Calculated Properties of Franklinite
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Electron Density: |
relectron=4.96 gm/cc note: rFranklinite =5.26 gm/cc. |
Fermion Index |
Fermion Index = 0.01493 Boson Index = 0.98507 |
Photoelectric: |
PEFranklinite = 24.90 barns/electron U=PEFranklinite x relectron= 123.61 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Franklinite is Not Radioactive |
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Franklinite Classification
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Dana Class: |
7.2.2.4 (7)Multiple Oxides |
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(7.2)(A+ B++)2 X4 Spinel group |
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(7.2.2)(Iron subgroup) |
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7.2.2.1 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m |
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7.2.2.2 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m |
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7.2.2.3 Magnetite FeFe2O4 F d3m 4/m 3 2/m |
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7.2.2.4 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m |
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7.2.2.5 Trevorite NiFe2O4 F d3m 4/m 3 2/m |
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7.2.2.6 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m |
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7.2.2.7 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m |
Strunz Class: |
IV/B.02-60 IV - Oxides |
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IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), Ferrite-Spinels |
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IV/B.02 - Spinel group, Magnesioferrite - Franklinite series |
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IV/B.02-10 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m |
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IV/B.02-20 Magnetite FeFe2O4 F d3m 4/m 3 2/m |
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IV/B.02-30 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m |
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IV/B.02-40 Trevorite NiFe2O4 F d3m 4/m 3 2/m |
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IV/B.02-50 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m |
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IV/B.02-60 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m |
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Other Franklinite Information
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References: |
NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
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 :
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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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