Mineralogy Database

Humboldtine Mineral Data

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General Humboldtine Information

Help on Chemical  Formula: Chemical Formula: Fe++(C2O4)•2(H2O)
Help on Composition: Composition: Molecular Weight = 179.90 gm
   Iron      31.04 %  Fe   39.94 % FeO
   Hydrogen   2.24 %  H    20.03 % H2O
   Carbon    13.35 %  C    40.03 % C2O3
   Oxygen    53.36 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+(C2O4)•2(H2O)
Help on Environment: Environment: Lignite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1821
Help on Locality: Locality: Korozluky, SW of Bilin, Bohemia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alexander von Humboldt (1769-1859), German explorer and naturalist.
Help on Name Pronunciation: Name Pronunciation: Humboldtine + Pronunciation Say HUMBOLDTINE
Help on Synonym: Synonym: ICSD 16813
  PDF 23-293

Humboldtine Image

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Comments: Yellow crystals of humboldtine.
Location: Lomnice, Sokolov, Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Humboldtine Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7856:1:1.7471
Help on Cell Dimensions: Cell Dimensions: a = 9.921, b = 5.556, c = 9.707, Z = 4; beta = 104.5° V = 518.02 Den(Calc)= 2.31
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.8(1), 4.7(0.65), 3.004(0.5),

Physical Properties of Humboldtine

Help on Cleavage: Cleavage: {110} Perfect, {100} Indistinct, {010} Indistinct
Help on Color: Color: Brownish yellow, Yellow.
Help on Density: Density: 2.28
Help on Diaphaneity: Diaphaneity: Transparent to Dull
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light yellow

Optical Properties of Humboldtine

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.784 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.761 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2521,KPDmeas= 0.2554,KC= 0.1432
Ncalc = 1.33
Help on Optical Data: Optical Data: Biaxial (+), a=1.494, b=1.561, g=1.692, bire=0.1980
Help on Pleochroism (x): Pleochroism (x): pale yellowish green.
Help on Pleochroism (y): Pleochroism (y): pale greenish yellow.
Help on Pleochroism (z): Pleochroism (z): intense yellow.

Calculated Properties of Humboldtine

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.31 gm/cc
note: Specific Gravity of Humboldtine =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0083096444
Boson Index = 0.9916903556
Help on Photoelectric: Photoelectric: PEHumboldtine = 9.22 barns/electron
U=PEHumboldtine x rElectron Density= 21.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Humboldtine is Not Radioactive

Humboldtine Classification

Help on  Dana Class: Dana Class: (50)Salts of Organic Acids
  (50.01.03)Humboldtine Group Humboldtine Fe(C2O4)•2(H2O) I2/a 2/m Glushinskite Mg(C2O4)•2(H2O) C 2/c 2/m Lindbergite! Mn(C2O4)•2(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 10.AB.05 10 - ORGANIC COMPOUNDS
  10.A - Salts of Organic Acids
  10.AB -Oxalates
10.AB.05 Humboldtine Fe(C2O4)•2(H2O) I2/a 2/m
10.AB.05 Lindbergite! Mn(C2O4)•2(H2O) C 2/c 2/m

Other Humboldtine Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Humboldtine :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 10.AB.05





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