General Fredrikssonite Information
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Chemical Formula: |
Mg2(Mn+++,Fe+++)O2(BO3) |
Composition: |
Molecular Weight = 194.81 gm |
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Magnesium 24.95 % Mg 41.38 % MgO |
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Manganese 14.10 % Mn 20.26 % Mn2O3 |
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Iron 14.33 % Fe 20.49 % Fe2O3 |
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Boron 5.55 % B 17.87 % B2O3 |
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Oxygen 41.06 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Mg2Mn3+0.5Fe3+0.5O2(BO3) |
Environment: |
In dolomite. |
IMA Status: |
Approved IMA 1983 |
Locality: |
Langban, Varmland, Sweden. Link to MinDat.org Location Data. |
Name Origin: |
Named for Kurt A. Fredriksson (1926-), Swedish-U.S. Geochemist. |
Synonym: |
ICSD 70102 |
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PDF 38-412 |
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Fredrikssonite Image |
Images:
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Fredrikssonite Crystallography
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Axial Ratios: |
a:b:c =0.7311:1:0.2352 |
Cell Dimensions: |
a = 9.18, b = 12.555, c = 2.954, Z = 4; V = 340.46 Den(Calc)= 3.80 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam |
X Ray Diffraction: |
By Intensity(I/Io): 2.59(1), 2.486(0.9), 5.16(0.8), |
Crystal Structure:
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Burns P C , Cooper M A , Hawthorne F C , The Canadian Mineralogist , 32 (1994) p.397-403, Jahn-Teller-distorted MnO6 octahedra in fredrikssonite, the fourth polymorph, of Mg2Mn(BO3)O2
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Physical Properties of Fredrikssonite
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Cleavage: |
[???] Poor, [???] Indistinct |
Color: |
Reddish brown. |
Density: |
3.84 |
Diaphaniety: |
Translucent |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
6 - Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
yellowish brown |
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Optical Properties of Fredrikssonite
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Gladstone-Dale: |
CI meas= 0.061 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2342,KPDmeas= 0.2318,KC= 0.2467 |
Optical Data: |
Biaxial (+), a=1.82, b=1.86, g=1.99, bire=0.1700, 2V(Calc)=62, 2V(Meas)=51. |
Pleochroism (x): |
golden brown. |
Pleochroism (y): |
dark reddish brown. |
Pleochroism (z): |
black. |
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Calculated Properties of Fredrikssonite
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Electron Density: |
relectron=3.69 gm/cc note: rFredrikssonite =3.80 gm/cc. |
Fermion Index |
Fermion Index = 0.03923 Boson Index = 0.96077 |
Photoelectric: |
PEFredrikssonite = 8.51 barns/electron U=PEFredrikssonite x relectron= 31.39 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fredrikssonite is Not Radioactive |
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Fredrikssonite Classification
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Dana Class: |
24.2.1.6 (24)Borates - Anhydrous |
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(24.2)where (A)2 BO2 [XO3] |
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(24.2.1)Ludwigite Group (Space Group: Pbam) |
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24.2.1.1 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m |
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24.2.1.2 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m |
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24.2.1.3 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m |
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24.2.1.4 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m |
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24.2.1.5 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m |
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24.2.1.6 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m |
Strunz Class: |
V/G.04-50 V - Nitrates, Carbonates and Borates |
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V/G - "Insel" borates [BO3]3- "inseln" |
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V/G.04 - Ludwigite group |
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V/G.04-10 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m |
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V/G.04-20 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m |
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V/G.04-30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m |
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V/G.04-40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m |
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V/G.04-50 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m |
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V/G.04-60 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m |
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V/G.04-70 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m |
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V/G.04-80 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m |
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V/G.04-90 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m |
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V/G.04-100 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 63 6 |
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Other Fredrikssonite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Fredrikssonite :
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 - Scandinavian mineral gallery
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Fredrikssonite Specimen Label here :
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Fredrikssonite
Mg2(Mn+++,Fe+++)O2(BO3)
Dana No: 24.2.1.6 Strunz No: V/G.04-50
Locality:
Notes:
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