Lipscombite Mineral Data

General Lipscombite Information

Chemical Formula:

(Fe++,Mn)Fe+++2(PO4)2(OH)2

Composition:

Molecular Weight = 391.27 gm

Manganese 3.51 % Mn 4.53 % MnO

Iron 39.25 % Fe 13.77 % FeO / 40.81 % Fe₂O₃

Phosphorus 15.83 % P 36.28 % P₂O₅

Hydrogen 0.52 % H 4.60 % H₂O

Oxygen 40.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.75Mn²⁺_0.25Fe³⁺₂(PO₄)₂(OH)₂

Environment:

Hydrothermally altered phosphate zone of a complex granite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Sapucaia pegmatite mine, about 50 km east-southeast of Governador Valadares, Minas Gerais, Brazil Link to MinDat.org Location Data.

Name Origin:

Named for William Nunn Lipscomb (1909- ), mineralogist, University of Minnesota, Minneapolis, Minnesota, USA, who determined the crystal structure of the synthetic compound.

Name Pronunciation:

Lipscombite + Pronunciation

Synonym:

ICSD 202937

PDF 45-1454

Lipscombite Image

Images:

Lipscombite

Comments: Light to dark green botryoidal lipscombite crust on rock.
Location: Valmy, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lipscombite Crystallography

Axial Ratios:

a:c = 1:1.80738

Cell Dimensions:

a = 7.31, c = 13.212, Z = 4; V = 706.00 Den(Calc)= 3.68

Crystal System:

Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: P 4₁2₁2

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

By Intensity(I/I_o): 3.314(1), 3.206(0.6), 1.656(0.4),

Crystal Structure:

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Vencato I , Mattievich E , Mascarenhas Y P , American Mineralogist , 74 (1989) p.456-460, Crystal structure of synthetic lipscombite: A redetermination

Physical Properties of Lipscombite

Color:

Green gray, Olive green, Black.

Density:

3.66

Diaphaneity:

Opaque

Optical Properties of Lipscombite

Optical Data:

NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.2454) where Ncalc=Dcalc*KC+1
NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.2454) where Ncalc=Dmeas*KC+1

Calculated Properties of Lipscombite

Electron Density:

Bulk Density (Electron Density)=3.57 gm/cc
note: Specific Gravity of Lipscombite =3.68 gm/cc.

Fermion Index:

Fermion Index = 0.0085183369
Boson Index = 0.9914816631

Photoelectric:

PE_Lipscombite= 13.45 barns/electron
U=PE_Lipscombite x rElectron Density= 48.00 barns/cc.

Radioactivity:

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

Lipscombite Classification

Dana Class:

41.10.02.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.02)Lipscombite Group

41.10.02.01 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

41.10.02.02 Zinclipscombite! ZnFe2(PO4)2(OH) P 4₃2₁2 or P 4₁2₁2 4 2 2

Strunz Class:

08.BB.90 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.90 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

08.BB.90 Richellite Ca3Fe10(PO4)8(OH)12•n(H2O) P 4 4

08.BB.90 Zinclipscombite! ZnFe2(PO4)2(OH) P 4₃2₁2 or P 4₁2₁2 4 2 2

Other Lipscombite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Lipscombite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Lipscombite here :
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Print or Cut-and-Paste your Lipscombite Specimen Label here :

Lipscombite

(Fe++,Mn)Fe+++2(PO4)2(OH)2
Dana No: 41.10.02.01 Strunz No: 08.BB.90
Locality:

Notes: