Humboldtine Mineral Data

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.

Synonym:

ICSD 16813

PDF 23-293

Humboldtine Image

Images:

Humboldtine

Comments: Yellow crystals of humboldtine.
Location: Lomnice, Sokolov, Z?padocesk? 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

Diaphaniety:

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

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:

r_electron=2.31 gm/cc
note: r_Humboldtine=2.31 gm/cc.

Fermion Index

Fermion Index = 0.0083
Boson Index = 0.9917

Photoelectric:

PE_Humboldtine= 9.22 barns/electron
U=PE_Humboldtine x r_electron= 21.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Humboldtine is Not Radioactive

Humboldtine Classification

Dana Class:

50.1.3.1 (50)Salts of Organic Acids

(50.1)(Oxalates)

(50.1.3)Dana Group

50.1.3.1 Humboldtine Fe(C2O4)·2(H2O) I2/a 2/m

50.1.3.2 Glushinskite Mg(C2O4)·2(H2O) C 2/c 2/m

50.1.3.3 Lindbergite! Mn(C2O4)·2(H2O) C 2/c 2/m

Strunz Class:

IX/A.01-50 IX - Organic compunds

IX/A - Oxalates. Salts from organic acids. [C2O4]2- arranged after increasing cation size

IX/A.01 - Whewellite - Wheatleyite series

IX/A.01-05 Natroxalate! Na2C2O4 P 2₁/a 2/m

IX/A.01-10 Whewellite Ca(C2O4)·(H2O) P 2₁/n 2/m

IX/A.01-20 Weddellite Ca(C2O4)·2(H2O) I 4/m 4/m

IX/A.01-25 Caoxite! Ca(C2O4)·3(H2O) P1 1

IX/A.01-28 Novgorodovaite! Ca2(C2O4)Cl2·2(H2O) I2/m 2/m

IX/A.01-30 Oxammite (NH4)2(C2O4)·(H2O) P 2₁2₁2 2 2 2

IX/A.01-40 Glushinskite Mg(C2O4)·2(H2O) C 2/c 2/m

IX/A.01-50 Humboldtine Fe(C2O4)·2(H2O) I2/a 2/m

IX/A.01-55 Lindbergite! Mn(C2O4)·2(H2O) C 2/c 2/m

IX/A.01-60 Minguzzite K3Fe(C2O4)3·3(H2O) P 2₁/c 2/m

IX/A.01-70 Zhemchuzhnikovite NaMg(Al,Fe)(C2O4)3·8(H2O) Unk Trig

IX/A.01-80 Stepanovite NaMgFe(C2O4)3·8-9(H2O) Unk Trig

IX/A.01-90 Moolooite Cu(C2O4)·n(H2O)(n<1) Unk Ortho

IX/A.01-100 Wheatleyite Na2Cu(C2O4)2·2(H2O) P1 1

IX/A.01-110 Coskrenite-(Ce)! (Ce,Nd,La)2(SO4)2(C2O4)·8(H2O) C 2/c 2/m

IX/A.01-120 Levinsonite-(Y)! (Y,Nd,La)Al(SO4)2(C2O4)·12(H2O) P 2/n 2/m

IX/A.01-130 Zugshunstite-(Ce)! (Ce,Nd,La)Al(SO4)2(C2O4)·8(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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Humboldtine

Fe++(C2O4)·2(H2O)
Dana No: 50.1.3.1 Strunz No: IX/A.01-50
Locality:

Notes: