Mantienneite Mineral Data

General Mantienneite Information

Chemical Formula:

KMg2Al2Ti(PO4)4(OH)3•15(H2O)

Composition:

Molecular Weight = 890.69 gm

Potassium 4.39 % K 5.29 % K₂O

Magnesium 5.46 % Mg 9.05 % MgO

Titanium 5.38 % Ti 8.97 % TiO₂

Aluminum 6.06 % Al 11.45 % Al₂O₃

Phosphorus 13.91 % P 31.87 % P₂O₅

Hydrogen 3.73 % H 33.37 % H₂O

Oxygen 61.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KMg₂Al₂Ti(PO₄)₄(OH)₃•15(H₂O)

Environment:

Replacing minerals in and forming the matrix of sandy layers in lacustrine shale.

IMA Status:

Approved IMA 1984

Locality:

Anloua, near Ngaoundere, Cameroon. Link to MinDat.org Location Data.

Name Origin:

Named for Joseph Mantienne (1929-), Bureau de Recherches G´eologiques et Mini`eres, Orl`eans, France.

Name Pronunciation:

Mantienneite + Pronunciation

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Mantienneite Crystallography

Axial Ratios:

a:b:c =0.512:1:0.6056

Cell Dimensions:

a = 10.409, b = 20.33, c = 12.312, Z = 4; V = 2,605.40 Den(Calc)= 2.27

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

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

By Intensity(I/I_o): 6.158(1), 3.076(0.6), 10.18(0.4),

Physical Properties of Mantienneite

Cleavage:

{001} Perfect, {010} Indistinct

Color:

Yellow brown.

Density:

2.31

Fracture:

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

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

reddish gray

Optical Properties of Mantienneite

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2559,KPDmeas= 0.2515,KC= 0.2592
Ncalc = 1.59 - 1.6

Optical Data:

Biaxial (-), a=1.564, g=1.598, bire=0.0340, 2V(Meas)=50-60.

Calculated Properties of Mantienneite

Electron Density:

Bulk Density (Electron Density)=2.32 gm/cc
note: Specific Gravity of Mantienneite =2.27 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Mantienneite= 2.32 barns/electron
U=PE_Mantienneite x r_electron= 5.38 barns/cc.

Radioactivity:

GRapi = 64.85 (Gamma Ray American Petroleum Institute Units)
Concentration of Mantienneite per GRapi unit = 1.54 (%)

Estimated Radioactivity from Mantienneite - barely detectable

Mantienneite Classification

Dana Class:

42.11.21.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.21)Paulkerrite Group

42.11.21.01 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

42.11.21.02 Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

42.11.21.03 Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na2₁ Ortho

42.11.21.04 Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2•14(H2O) P bca 2/m 2/m 2/m

Strunz Class:

08.DH.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.35 Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2•14(H2O) P bca 2/m 2/m 2/m

08.DH.35 Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na2₁ Ortho

08.DH.35 Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

08.DH.35 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

Other Mantienneite Information

References:

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

See Also:

Links to other databases for Mantienneite :
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 Mantienneite here :
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Print or Cut-and-Paste your Mantienneite Specimen Label here :

Mantienneite

KMg2Al2Ti(PO4)4(OH)3•15(H2O)
Dana No: 42.11.21.02 Strunz No: 08.DH.35
Locality:

Notes: