Humboldtine Mineral Data

General Humboldtine Information

Chemical Formula:

Fe++(C2O4)•2(H2O)

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

Empirical Formula:

Fe²⁺(C₂O₄)•2(H₂O)

Environment:

Lignite deposits.

IMA Status:

Valid Species (Pre-IMA) 1821

Locality:

Korozluky, SW of Bilin, Bohemia. Link to MinDat.org Location Data.

Name Origin:

Named for Alexander von Humboldt (1769-1859), German explorer and naturalist.

Name Pronunciation:

Humboldtine + Pronunciation

Synonym:

ICSD 16813

PDF 23-293

Humboldtine Image

Images:

Humboldtine

Comments: Yellow crystals of humboldtine.
Location: Lomnice, Sokolov, ZÃ¡padoceskÃ½ Kraj, Bohemia, Czech Republic. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Humboldtine Crystallography

Axial Ratios:

a:b:c =1.7856:1:1.7471

Cell Dimensions:

a = 9.921, b = 5.556, c = 9.707, Z = 4; beta = 104.5° V = 518.02 Den(Calc)= 2.31

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.8(1), 4.7(0.65), 3.004(0.5),

Physical Properties of Humboldtine

Cleavage:

{110} Perfect, {100} Indistinct, {010} Indistinct

Color:

Brownish yellow, Yellow.

Density:

2.28

Diaphaneity:

Transparent to Dull

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Magnetism:

Nonmagnetic

Streak:

light yellow

Optical Properties of Humboldtine

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

Optical Data:

Biaxial (+), a=1.494, b=1.561, g=1.692, bire=0.1980

Pleochroism (x):

pale yellowish green.

Pleochroism (y):

pale greenish yellow.

Pleochroism (z):

intense yellow.

Calculated Properties of Humboldtine

Electron Density:

Bulk Density (Electron Density)=2.31 gm/cc
note: Specific Gravity of Humboldtine =2.31 gm/cc.

Fermion Index:

Fermion Index = 0.0083096444
Boson Index = 0.9916903556

Photoelectric:

PE_Humboldtine= 9.22 barns/electron
U=PE_Humboldtine x rElectron Density= 21.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Humboldtine is Not Radioactive

Humboldtine Classification

Dana Class:

50.01.03.01 (50)Salts of Organic Acids

(50.01)(Oxalates)

(50.01.03)Humboldtine Group

50.01.03.01 Humboldtine Fe(C2O4)•2(H2O) I2/a 2/m

50.01.03.02 Glushinskite Mg(C2O4)•2(H2O) C 2/c 2/m

50.01.03.03 Lindbergite! Mn(C2O4)•2(H2O) C 2/c 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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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Humboldtine

Fe++(C2O4)•2(H2O)
Dana No: 50.01.03.01 Strunz No: 10.AB.05
Locality:

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