Laubmannite Mineral Data

Laubmannite Mineral Data

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General Laubmannite Information

Chemical Formula:

Fe++3Fe+++6(PO4)4(OH)12

Composition:

Molecular Weight = 1,086.60 gm

Iron 46.26 % Fe 19.84 % FeO / 44.09 % Fe₂O₃

Phosphorus 11.40 % P 26.13 % P₂O₅

Hydrogen 1.11 % H 9.95 % H₂O

Oxygen 41.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₃Fe³⁺₆(PO₄)₄(OH)₁₂

Environment:

Mixture of dufrenite, kidwellite and beraunite.

IMA Status:

Discredited IMA 1990

Locality:

Shady, Polk Co., Arkansas, USA Link to MinDat.org Location Data.

Name Origin:

Named for Heinrich Laubmann (1865-1951), German mineralogist.

Synonym:

Discredited

Laubmannite Image

Images:

Laubmannite Goethite

Comments: Reddish brown goethite hosting radiating sprays of olive green laubmannite to 3 cm across.
Location: Buckeye Mountain, Polk County, Arkansas, USA. Scale: 10.5 x 7.5 cm.
© John Veevaert

Laubmannite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Laubmannite

Color:

Brown, Greenish brown, Grayish green, Yellow green, Dark green.

Density:

3.33

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Silky

Streak:

greenish

Calculated Properties of Laubmannite

Electron Density:

r_electron=3.25 gm/cc
note: r_Laubmannite=3.33 gm/cc.

Fermion Index

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Laubmannite= 14.38 barns/electron
U=PE_Laubmannite x r_electron= 46.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laubmannite is Not Radioactive

Laubmannite Classification

Dana Class:

37.0.0.0 (37)Phosphate Minerals

(37.0)Without Dana Classification Numbers

(Phosphate, Basic)

Strunz Class:

VII/B.14-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.14 - Pseudomalachite group, Laubmannite series

VII/B.14-10 Laubmannite Fe3Fe6(PO4)4(OH)12 Unk Ortho

Other Laubmannite Information

See Also:

Links to other databases for Laubmannite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Laubmannite

Fe++3Fe+++6(PO4)4(OH)12
Dana No: Unknown Strunz No: VII/B.14-10
Locality:

Notes: