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 - PrismaticH-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

Search for Humboldtine using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Humboldtine :

A Bijoux Google Search for Humboldtine
Adam's Minerals Google Search for Humboldtine
Cape Minerals Google Search for Humboldtine
Dakota Matrix Minerals Google Search for Humboldtine
Excalibur Mineral Corp. Google Search for Humboldtine
Exceptional Minerals Google Search for Humboldtine
John Betts Fine Minerals Search for Humboldtine
McDougall Minerals Google Search for Humboldtine
Mineral News Website Link
Rock and Mineral Shows Google Search for Humboldtine
Weinrich Minerals, Inc. Google Search for Humboldtine

Ask about Humboldtine here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Humboldtine Specimen Label here :

Humboldtine

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

Notes: