Mineralogy Database

Fredrikssonite Mineral Data

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General Fredrikssonite Information

Help on Chemical  Formula: Chemical Formula: Mg2(Mn+++,Fe+++)O2(BO3)
Help on Composition: Composition: Molecular Weight = 194.81 gm
   Magnesium  24.95 %  Mg   41.38 % MgO
   Manganese  14.10 %  Mn   20.26 % Mn2O3
   Iron       14.33 %  Fe   20.49 % Fe2O3
   Boron       5.55 %  B    17.87 % B2O3
   Oxygen     41.06 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2Mn3+0.5Fe3+0.5O2(BO3)
Help on Environment: Environment: In dolomite.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kurt A. Fredriksson (1926-), Swedish-U.S. Geochemist.
Help on Name Pronunciation: Name Pronunciation: Fredrikssonite + Pronunciation Say FREDRIKSSONITE
Help on Synonym: Synonym: ICSD 70102
  PDF 38-412

Fredrikssonite Image

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  Fredrikssonite   Hausmannite

Comments: Red-brown elongated crystalline fredrikssonite in calcite with granular hausmannite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fredrikssonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7311:1:0.2352
Help on Cell Dimensions: Cell Dimensions: a = 9.18, b = 12.555, c = 2.954, Z = 4; V = 340.46 Den(Calc)= 3.80
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.59(1), 2.486(0.9), 5.16(0.8),

Physical Properties of Fredrikssonite

Help on Cleavage: Cleavage: {???} Poor, {???} Indistinct
Help on Color: Color: Reddish brown.
Help on Density: Density: 3.84
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellowish brown

Optical Properties of Fredrikssonite

Help on Gladstone-Dale: 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
Ncalc = 1.94 - 1.95
Help on Optical Data: Optical Data: Biaxial (+), a=1.82, b=1.86, g=1.99, bire=0.1700, 2V(Calc)=62, 2V(Meas)=51.
Help on Pleochroism (x): Pleochroism (x): golden brown.
Help on Pleochroism (y): Pleochroism (y): dark reddish brown.
Help on Pleochroism (z): Pleochroism (z): black.

Calculated Properties of Fredrikssonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.69 gm/cc
note: Specific Gravity of Fredrikssonite =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEFredrikssonite = 8.51 barns/electron
U=PEFredrikssonite x rElectron Density= 31.39 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fredrikssonite is Not Radioactive

Fredrikssonite Classification

Help on  Dana Class: Dana Class: (24)Borates - Anhydrous
  (24.02)where (A)2 BO2 [XO3]
  (24.02.01)Ludwigite Group (Space Group: Pbam) Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 06.AB.30 06 - BORATES
  06.A - Monoborates
  06.AB -BO3, with additional anions; 1(D) + OH, etc.
06.AB.30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m
06.AB.30 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m
06.AB.30 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m
06.AB.30 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m
06.AB.30 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

Other Fredrikssonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Fredrikssonite :
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 - Scandinavian mineral gallery

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Dana No: Strunz No: 06.AB.30





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